 
                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 Bernhard  Hiller
                                    Bernhard  Hiller
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 John S.  Deeken
                                    John S.  Deeken
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Thomas G.  Andrikowich
                                    Thomas G.  Andrikowich
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Charles  deJesus
                                    Charles  deJesus
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Paul  Stasiewicz
                                    Paul  Stasiewicz
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Peter M.  Martino
                                    Peter M.  Martino
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Wei  Guo
                                    Wei  Guo
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 A. David L.  Michael
                                    A. David L.  Michael
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Bruce A.  Liikanen
                                    Bruce A.  Liikanen
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Kimberly C.  Mann
                                    Kimberly C.  Mann
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Vaclav  Prochazka
                                    Vaclav  Prochazka
                                 H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
                                    H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Thomas G.  Andrikowich
                                    Thomas G.  Andrikowich
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Francis P.  Crimi
                                    Francis P.  Crimi
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Rickmer  Kose
                                    Rickmer  Kose
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Stanislaw  Dobosz
                                    Stanislaw  Dobosz
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Stanislaw  Dobosz
                                    Stanislaw  Dobosz
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Mark S.  Crowder
                                    Mark S.  Crowder
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Bruce  Liikanen
                                    Bruce  Liikanen
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Stan  Shepherd
                                    Stan  Shepherd
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Wei  Guo
                                    Wei  Guo
                                 E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
                                    E05 - LOCKS KEYS WINDOW OR DOOR FITTINGS SAFES
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 David D.  Brause
                                    David D.  Brause
                                 B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
                                    B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Jingfeng  Liu
                                    Jingfeng  Liu
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Albert J.  Wallash
                                    Albert J.  Wallash
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Lance  Flake
                                    Lance  Flake
                                 G06 - COMPUTING CALCULATING COUNTING
                                    G06 - COMPUTING CALCULATING COUNTING
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Jim  Chiao
                                    Jim  Chiao
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 E. Noel  Abarra
                                    E. Noel  Abarra
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Mourad  Benakli
                                    Mourad  Benakli
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Larry E.  Wittig
                                    Larry E.  Wittig
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Thomas G.  Andrikowich
                                    Thomas G.  Andrikowich
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Jay  Jeong
                                    Jay  Jeong
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 John S.  Deeken
                                    John S.  Deeken
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Stanislaw  Dobosz
                                    Stanislaw  Dobosz
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Gerardo  Buitron
                                    Gerardo  Buitron
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Mirmehdi L.  Abrishamchian
                                    Mirmehdi L.  Abrishamchian
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 S. Craig Smith
                                    S. Craig Smith
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 YU  SUN
                                    YU  SUN
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Michael  Mallary
                                    Michael  Mallary
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Stan  Shepherd
                                    Stan  Shepherd
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Dave  McMurtrey
                                    Dave  McMurtrey
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Craig  Smith
                                    Craig  Smith
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Yu  Sun
                                    Yu  Sun
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Yu  Sun
                                    Yu  Sun
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 PAUL  STASIEWICZ
                                    PAUL  STASIEWICZ
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 CRUZ R.  CALDERON
                                    CRUZ R.  CALDERON
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Yu  Sun
                                    Yu  Sun
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Mohamed Dulfakir  Abdul Hameed
                                    Mohamed Dulfakir  Abdul Hameed
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Peter C. Jann
                                    Peter C. Jann
                                 G01 - MEASURING TESTING
                                    G01 - MEASURING TESTING
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Mourad  Benakli
                                    Mourad  Benakli
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Peter M.  Martino
                                    Peter M.  Martino
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Bulent  Goksel
                                    Bulent  Goksel
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 SEAGATE TECHNOLOGY
                                    SEAGATE TECHNOLOGY
                                 Erhard  Schreck
                                    Erhard  Schreck
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Bernhard  Hiller
                                    Bernhard  Hiller
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Erhard  Schreck
                                    Erhard  Schreck
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Xin H. Yang
                                    Xin H. Yang
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 JoAnn C.  Vigil
                                    JoAnn C.  Vigil
                                 G01 - MEASURING TESTING
                                    G01 - MEASURING TESTING
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Jonathan S.  Haynes
                                    Jonathan S.  Haynes
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Yu  Sun
                                    Yu  Sun
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Kwang Kon Kim
                                    Kwang Kon Kim
                                 C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
                                    C23 - COATING METALLIC MATERIAL COATING MATERIAL WITH METALLIC MATERIAL CHEMI...
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 Larry  Hutsell
                                    Larry  Hutsell
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 John Edward  Scura
                                    John Edward  Scura
                                 G11 - INFORMATION STORAGE
                                    G11 - INFORMATION STORAGE
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 Maxtor Corporation
                                    Maxtor Corporation
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 42 - Scientific and technological services and research and design relating thereto
                                    42 - Scientific and technological services and research and design relating thereto
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 42 - Scientific and technological services and research and design relating thereto
                                    42 - Scientific and technological services and research and design relating thereto
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 35 - Advertising
                                    35 - Advertising
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 41 - Education
                                    41 - Education
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 35 - Advertising
                                    35 - Advertising
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 SEAGATE TECHNOLOGY LLC
                                    SEAGATE TECHNOLOGY LLC
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                 MAXTOR CORPORATION
                                    MAXTOR CORPORATION
                                 9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments
                                    9 - Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments