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                        3608300
                    
                                            
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                                    Patent number 3,608,300
                                
 
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                                    Issue date Sep 28, 1971
                                
 
                        
                                                                
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                                    G04 - HOROLOGY
                                 
                        
                 
             
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                        2209642
                    
                                            
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                                    Patent number 2,209,642
                                
 
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                                    Issue date Jul 30, 1940
                                
 
                        
                                                                
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                                    G04 - HOROLOGY
                                 
                        
                 
             
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                        2186159
                    
                                            
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                                    Patent number 2,186,159
                                
 
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                                    Issue date Jan 9, 1940
                                
 
                        
                                                                
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                                    G04 - HOROLOGY
                                 
                        
                 
             
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                        1959601
                    
                                            
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                                    Patent number 1,959,601
                                
 
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                                    Issue date May 22, 1934
                                
 
                        
                                                                
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                                    G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
                                 
                        
                 
             
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                        1548772
                    
                                            
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                                    Patent number 1,548,772
                                
 
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                                    Issue date Aug 4, 1925
                                
 
                        
                                                                
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                                    G04 - HOROLOGY
                                 
                        
                 
             
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                        1153492
                    
                                            
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                                    Patent number 1,153,492
                                
 
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                                    Issue date Sep 14, 1915
                                
 
                        
                                                                
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                                    G04 - HOROLOGY