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                        3745335
                    
                                            
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                                    Patent number 3,745,335
                                
 
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                                    Issue date Jul 10, 1973
                                
 
                        
                                                                
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                        3659261
                    
                                            
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                                    Patent number 3,659,261
                                
 
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                                    Issue date Apr 25, 1972
                                
 
                        
                                                                
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                        3605081
                    
                                            
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                                    Patent number 3,605,081
                                
 
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                                    Issue date Sep 14, 1971
                                
 
                        
                                                                
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                        3573441
                    
                                            
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                                    Patent number 3,573,441
                                
 
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                                    Issue date Apr 6, 1971
                                
 
                        
                                                                
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                                    G01 - MEASURING TESTING
                                 
                        
                 
             
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                        3556236
                    
                                            
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                                    Patent number 3,556,236
                                
 
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                                    Issue date Jan 19, 1971
                                
 
                        
                                                                
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                                    G01 - MEASURING TESTING
                                 
                        
                 
             
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                        3486008
                    
                                            
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                                    Patent number 3,486,008
                                
 
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                                    Issue date Dec 23, 1969
                                
 
                        
                                                                
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                        3372267
                    
                                            
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                                    Patent number 3,372,267
                                
 
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                                    Issue date Mar 5, 1968
                                
 
                        
                                                                
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                        3339068
                    
                                            
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                                    Patent number 3,339,068
                                
 
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                                    Issue date Aug 29, 1967
                                
 
                        
                                                                
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                        3144225
                    
                                            
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                                    Patent number 3,144,225
                                
 
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                                    Issue date Aug 11, 1964
                                
 
                        
                                                                
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                        3097791
                    
                                            
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                                    Patent number 3,097,791
                                
 
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                                    Issue date Jul 16, 1963
                                
 
                        
                                                                
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                                    G08 - SIGNALLING
                                 
                        
                 
             
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                        3046394
                    
                                            
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                                    Patent number 3,046,394
                                
 
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                                    Issue date Jul 24, 1962
                                
 
                        
                                                                
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                        2994764
                    
                                            
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                                    Patent number 2,994,764
                                
 
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                                    Issue date Aug 1, 1961
                                
 
                        
                                                                
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                        2964617
                    
                                            
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                                    Patent number 2,964,617
                                
 
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                                    Issue date Dec 13, 1960
                                
 
                        
                                                                
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                        2899544
                    
                                            
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                                    Patent number 2,899,544
                                
 
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                                    Issue date Aug 11, 1959
                                
 
                        
                                                                
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                                    G01 - MEASURING TESTING
                                 
                        
                 
             
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                        2721994
                    
                                            
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                                    Patent number 2,721,994
                                
 
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                                    Issue date Oct 25, 1955
                                
 
                        
                                                                
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                                    G01 - MEASURING TESTING
                                 
                        
                 
             
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                        2701301
                    
                                            
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                                    Patent number 2,701,301
                                
 
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                                    Issue date Feb 1, 1955
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2626751
                    
                                            
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                                    Patent number 2,626,751
                                
 
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                                    Issue date Jan 27, 1953
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2603419
                    
                                            
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                                    Patent number 2,603,419
                                
 
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                                    Issue date Jul 15, 1952
                                
 
                        
                                                                
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