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                        Respirator valve for respirators
                    
                                            
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                                    Patent number 4,172,467
                                
 
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                                    Issue date Oct 30, 1979
                                
 
                        
                                            
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                                    Dragerwerk Aktiengesellschaft
                                 
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                                    Detlef  Warnow
                                 
                        
                                            
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                                    A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
                                 
                        
                 
             
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                        3587628
                    
                                            
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                                    Patent number 3,587,628
                                
 
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                                    Issue date Jun 28, 1971
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        3575203
                    
                                            
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                                    Patent number 3,575,203
                                
 
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                                    Issue date Apr 20, 1971
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        3417918
                    
                                            
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                                    Patent number 3,417,918
                                
 
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                                    Issue date Dec 24, 1968
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        3402889
                    
                                            
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                                    Patent number 3,402,889
                                
 
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                                    Issue date Sep 24, 1968
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        3391784
                    
                                            
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                                    Patent number 3,391,784
                                
 
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                                    Issue date Jul 9, 1968
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        3256903
                    
                                            
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                                    Patent number 3,256,903
                                
 
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                                    Issue date Jun 21, 1966
                                
 
                        
                                                                
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                                    D21 - PAPER-MAKING PRODUCTION OF CELLULOSE
                                 
                        
                 
             
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                        2879793
                    
                                            
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                                    Patent number 2,879,793
                                
 
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                                    Issue date Mar 31, 1959
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2858845
                    
                                            
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                                    Patent number 2,858,845
                                
 
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                                    Issue date Nov 4, 1958
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2777432
                    
                                            
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                                    Patent number 2,777,432
                                
 
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                                    Issue date Jan 15, 1957
                                
 
                        
                                                                
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                                    F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
                                 
                        
                 
             
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                        2731026
                    
                                            
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                                    Patent number 2,731,026
                                
 
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                                    Issue date Jan 17, 1956
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2647345
                    
                                            
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                                    Patent number 2,647,345
                                
 
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                                    Issue date Aug 4, 1953
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2308187
                    
                                            
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                                    Patent number 2,308,187
                                
 
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                                    Issue date Jan 12, 1943
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2288024
                    
                                            
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                                    Patent number 2,288,024
                                
 
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                                    Issue date Jun 30, 1942
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2286188
                    
                                            
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                                    Patent number 2,286,188
                                
 
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                                    Issue date Jun 16, 1942
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2042906
                    
                                            
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                                    Patent number 2,042,906
                                
 
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                                    Issue date Jun 2, 1936
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2035151
                    
                                            
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                                    Patent number 2,035,151
                                
 
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                                    Issue date Mar 24, 1936
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        1960466
                    
                                            
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                                    Patent number 1,960,466
                                
 
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                                    Issue date May 29, 1934
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        1679215
                    
                                            
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                                    Patent number 1,679,215
                                
 
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                                    Issue date Jul 31, 1928
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        1335903
                    
                                            
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                                    Patent number 1,335,903
                                
 
                                - 
                                    Issue date Apr 6, 1920
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING