- 
                
                
                    
                        Electromagnetic protection cloth
                    
                                            
                                - 
                                    Patent number 8,421,045
                                
 
                                - 
                                    Issue date Apr 16, 2013
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Daniel Qi Tan
                                 
                        
                                            
                                - 
                                        
                                    H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        PTFE pleated filter element
                    
                                            
                                - 
                                    Patent number 8,282,713
                                
 
                                - 
                                    Issue date Oct 9, 2012
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Alan  Smithies
                                 
                        
                                            
                                - 
                                        
                                    B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
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            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        Treatment of porous article
                    
                                            
                                - 
                                    Patent number 7,771,818
                                
 
                                - 
                                    Issue date Aug 10, 2010
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Robert John  Klare
                                 
                        
                                            
                                - 
                                        
                                    C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
                    
                        Composite membrane
                    
                                            
                                - 
                                    Patent number 7,635,062
                                
 
                                - 
                                    Issue date Dec 22, 2009
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Robert J.  Klare
                                 
                        
                                            
                                - 
                                        
                                    C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
                                 
                        
                 
             
            - 
                
                
                    
                        Method of making a composite membrane
                    
                                            
                                - 
                                    Patent number 7,588,796
                                
 
                                - 
                                    Issue date Sep 15, 2009
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Robert J.  Klare
                                 
                        
                                            
                                - 
                                        
                                    Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMA...
                                 
                        
                 
             
            - 
                
                
                    
                        Treatment of porous article
                    
                                            
                                - 
                                    Patent number 7,534,471
                                
 
                                - 
                                    Issue date May 19, 2009
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Robert John  Klare
                                 
                        
                                            
                                - 
                                        
                                    C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        Filter mounting system
                    
                                            
                                - 
                                    Patent number 7,186,284
                                
 
                                - 
                                    Issue date Mar 6, 2007
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Jack Thomas  Clements
                                 
                        
                                            
                                - 
                                        
                                    Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
    
     
    
        
            
        
            
            - 
                
                
                    
                        DROPLET SHAPED FILTER FOR BAGHOUSE
                    
                                            
                                - 
                                    Publication number 20130180224
                                
 
                                - 
                                    Publication date Jul 18, 2013
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Tian Xuan Zhang
                                 
                        
                                            
                                - 
                                        
                                    B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        ELECTROMAGNETIC PROTECTION CLOTH
                    
                                            
                                - 
                                    Publication number 20130048370
                                
 
                                - 
                                    Publication date Feb 28, 2013
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP
                                 
                                - 
                                        
                                    Daniel Qi Tan
                                 
                        
                                            
                                - 
                                        
                                    H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
                                 
                        
                 
             
            - 
                
                
                    
                        PULSE DETONATION COAL GASIFICATION SYSTEM
                    
                                            
                                - 
                                    Publication number 20120279128
                                
 
                                - 
                                    Publication date Nov 8, 2012
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Tian Xuan  Zhang
                                 
                        
                                            
                                - 
                                        
                                    C10 - PETROLEUM, GAS OR COKE INDUSTRIES TECHNICAL GASES CONTAINING CARBON MON...
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
                    
                        BREATHABLE GASKET
                    
                                            
                                - 
                                    Publication number 20120061923
                                
 
                                - 
                                    Publication date Mar 15, 2012
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Nusrat  Farzana
                                 
                        
                                            
                                - 
                                        
                                    F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        PTFE PLEATED FILTER ELEMENT
                    
                                            
                                - 
                                    Publication number 20110139008
                                
 
                                - 
                                    Publication date Jun 16, 2011
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Alan  Smithies
                                 
                        
                                            
                                - 
                                        
                                    B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        TURBINE EXHAUST RECIRCULATION
                    
                                            
                                - 
                                    Publication number 20110048002
                                
 
                                - 
                                    Publication date Mar 3, 2011
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Robert Warren  Taylor
                                 
                        
                                            
                                - 
                                        
                                    F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
            
 
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            - 
                
                
            
 
            - 
                
                
            
 
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            - 
                
                
            
 
            - 
                
                
            
 
            - 
                
                
                    
                        MEMBRANE TABS
                    
                                            
                                - 
                                    Publication number 20100072145
                                
 
                                - 
                                    Publication date Mar 25, 2010
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Robert Henry  Devine, II
                                 
                        
                                            
                                - 
                                        
                                    B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
                                 
                        
                 
             
            - 
                
                
            
 
            - 
                
                
                    
                        OLEOPHOBIC LAMINATED ARTICLE
                    
                                            
                                - 
                                    Publication number 20090220763
                                
 
                                - 
                                    Publication date Sep 3, 2009
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Martin G.  Hatfield
                                 
                        
                                            
                                - 
                                        
                                    B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
                                 
                        
                 
             
            - 
                
                
                    
                        OLEOPHOBIC LAMINATED ARTICLE AND METHOD
                    
                                            
                                - 
                                    Publication number 20090220764
                                
 
                                - 
                                    Publication date Sep 3, 2009
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group, Inc.
                                 
                                - 
                                        
                                    Martin G.  Hatfield
                                 
                        
                                            
                                - 
                                        
                                    D06 - TREATMENT OF TEXTILES OR THE LIKE LAUNDERING FLEXIBLE MATERIALS NOT OTH...
                                 
                        
                 
             
    
     
    
        
            
        
            
            - 
                
                
                    
                        77830984 - PREVEIL
                    
                                            
                                - 
                                    Serial number 77830984
                                
 
                                - 
                                    Registration number 3908915
                                
 
                                - 
                                    Filing date Sep 21, 2009
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group Inc.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        77402651 - ASPIRE
                    
                                            
                                - 
                                    Serial number 77402651
                                
 
                                - 
                                    Registration number 3873803
                                
 
                                - 
                                    Filing date Feb 21, 2008
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    24 - Textiles and textile goods, not included in other classes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        77099310 - POWERWAVE+
                    
                                            
                                - 
                                    Serial number 77099310
                                
 
                                - 
                                    Registration number 3524819
                                
 
                                - 
                                    Filing date Feb 5, 2007
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    7 - Machines and machine tools
                                 
                        
                    
                 
             
            - 
                
                
                    
                        78887543 - E
                    
                                            
                                - 
                                    Serial number 78887543
                                
 
                                - 
                                    Registration number 3293936
                                
 
                                - 
                                    Filing date May 19, 2006
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    24 - Textiles and textile goods, not included in other classes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        78887548 - E
                    
                                            
                                - 
                                    Serial number 78887548
                                
 
                                - 
                                    Registration number 3433222
                                
 
                                - 
                                    Filing date May 19, 2006
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        78811339 - NANOPLEAT
                    
                                            
                                - 
                                    Serial number 78811339
                                
 
                                - 
                                    Registration number 3522572
                                
 
                                - 
                                    Filing date Feb 9, 2006
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        78784998 - PROVERO
                    
                                            
                                - 
                                    Serial number 78784998
                                
 
                                - 
                                    Filing date Jan 4, 2006
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    7 - Machines and machine tools
                                 
                        
                    
                 
             
            - 
                
                
                    
                        76561788 - MAX-9
                    
                                            
                                - 
                                    Serial number 76561788
                                
 
                                - 
                                    Registration number 3218400
                                
 
                                - 
                                    Filing date Nov 25, 2003
                                
 
                        
                                            
                                - 
                                        
                                    BHA Group Holdings, Inc.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        76550650 - ANALYTEC
                    
                                            
                                - 
                                    Serial number 76550650
                                
 
                                - 
                                    Registration number 2986870
                                
 
                                - 
                                    Filing date Oct 10, 2003
                                
 
                        
                                            
                                - 
                                        
                                    Analytec Corporation
                                 
                                - 
                                        
                                    7 - Machines and machine tools
                                 
                        
                    
                 
             
            - 
                
                
                    
                        75274636 - IN-DUCT HUMIDIFICATION
                    
                                            
                                - 
                                    Serial number 75274636
                                
 
                                - 
                                    Filing date Apr 14, 1997
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        75264862 - VAPORFECT
                    
                                            
                                - 
                                    Serial number 75264862
                                
 
                                - 
                                    Filing date Mar 27, 1997
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    7 - Machines and machine tools
                                 
                        
                    
                 
             
            - 
                
                
                    
                        75202059 - POWERPLEAT
                    
                                            
                                - 
                                    Serial number 75202059
                                
 
                                - 
                                    Filing date Nov 20, 1996
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        75153062 - INTELLI CLEAN
                    
                                            
                                - 
                                    Serial number 75153062
                                
 
                                - 
                                    Registration number 2234732
                                
 
                                - 
                                    Filing date Aug 20, 1996
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        75117590 - AIR MIZER
                    
                                            
                                - 
                                    Serial number 75117590
                                
 
                                - 
                                    Filing date Jun 12, 1996
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        75048111 - IMPAK
                    
                                            
                                - 
                                    Serial number 75048111
                                
 
                                - 
                                    Registration number 2232541
                                
 
                                - 
                                    Filing date Jan 24, 1996
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74677114 - BHA PULSE PLEAT
                    
                                            
                                - 
                                    Serial number 74677114
                                
 
                                - 
                                    Registration number 2031084
                                
 
                                - 
                                    Filing date May 19, 1995
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74677113 - TRI-LOFT
                    
                                            
                                - 
                                    Serial number 74677113
                                
 
                                - 
                                    Registration number 1971367
                                
 
                                - 
                                    Filing date May 19, 1995
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    24 - Textiles and textile goods, not included in other classes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74660562 - CPM 1000
                    
                                            
                                - 
                                    Serial number 74660562
                                
 
                                - 
                                    Registration number 1960303
                                
 
                                - 
                                    Filing date Apr 13, 1995
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74660560 - CPM 500
                    
                                            
                                - 
                                    Serial number 74660560
                                
 
                                - 
                                    Registration number 1960302
                                
 
                                - 
                                    Filing date Apr 13, 1995
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74637668 - BAGATATOR
                    
                                            
                                - 
                                    Serial number 74637668
                                
 
                                - 
                                    Filing date Feb 22, 1995
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    11 - Apparatus for lighting, heating, steam generating, cooking, refrigerating, drying, ventilating, water supply and sanitary purposes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74511299 - BHA-TEX
                    
                                            
                                - 
                                    Serial number 74511299
                                
 
                                - 
                                    Registration number 1896288
                                
 
                                - 
                                    Filing date Apr 11, 1994
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    24 - Textiles and textile goods, not included in other classes
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74511300 - CPM 3000
                    
                                            
                                - 
                                    Serial number 74511300
                                
 
                                - 
                                    Registration number 1882000
                                
 
                                - 
                                    Filing date Apr 11, 1994
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74511079 - TRI-LOFT
                    
                                            
                                - 
                                    Serial number 74511079
                                
 
                                - 
                                    Filing date Apr 11, 1994
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    1 - Chemicals used in industry, science and photography, as well as in agriculture, horticulture and forestry
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74418661 - CPM 2000
                    
                                            
                                - 
                                    Serial number 74418661
                                
 
                                - 
                                    Registration number 1875100
                                
 
                                - 
                                    Filing date Jul 30, 1993
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74098474 - BRINGING THE POWER OF THE COMPUTER TO RAPPER CONTROLS
                    
                                            
                                - 
                                    Serial number 74098474
                                
 
                                - 
                                    Registration number 1655439
                                
 
                                - 
                                    Filing date Sep 19, 1990
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74098473 - THE ADVANCED TECHNOLOGY AUTOMATIC VOLTAGE CONTROL
                    
                                            
                                - 
                                    Serial number 74098473
                                
 
                                - 
                                    Registration number 1655926
                                
 
                                - 
                                    Filing date Sep 19, 1990
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74077982 - METAPOXY
                    
                                            
                                - 
                                    Serial number 74077982
                                
 
                                - 
                                    Registration number 1647148
                                
 
                                - 
                                    Filing date Jul 13, 1990
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    2 - Paints, varnishes, lacquers
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74012213 - PRC-100
                    
                                            
                                - 
                                    Serial number 74012213
                                
 
                                - 
                                    Registration number 1614727
                                
 
                                - 
                                    Filing date Dec 18, 1989
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        74012214 - POWER GUARD SQ-300
                    
                                            
                                - 
                                    Serial number 74012214
                                
 
                                - 
                                    Filing date Dec 18, 1989
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 
                        
                    
                 
             
            - 
                
                
                    
                        73774504 - ACOUSTIC LANCE
                    
                                            
                                - 
                                    Serial number 73774504
                                
 
                                - 
                                    Registration number 1568080
                                
 
                                - 
                                    Filing date Jan 13, 1989
                                
 
                        
                                            
                                - 
                                        
                                    BHA GROUP, INC.
                                 
                                - 
                                        
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments