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                        3624563
                    
                                            
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                                    Patent number 3,624,563
                                
 
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                                    Issue date Nov 30, 1971
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3546633
                    
                                            
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                                    Patent number 3,546,633
                                
 
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                                    Issue date Dec 8, 1970
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3437931
                    
                                            
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                                    Patent number 3,437,931
                                
 
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                                    Issue date Apr 8, 1969
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3403402
                    
                                            
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                                    Patent number 3,403,402
                                
 
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                                    Issue date Sep 24, 1968
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3377565
                    
                                            
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                                    Patent number 3,377,565
                                
 
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                                    Issue date Apr 9, 1968
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3343088
                    
                                            
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                                    Patent number 3,343,088
                                
 
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                                    Issue date Sep 19, 1967
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3319168
                    
                                            
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                                    Patent number 3,319,168
                                
 
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                                    Issue date May 9, 1967
                                
 
                        
                                                                
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                                    H04 - ELECTRIC COMMUNICATION TECHNIQUE
                                 
                        
                 
             
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                        3277377
                    
                                            
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                                    Patent number 3,277,377
                                
 
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                                    Issue date Oct 4, 1966
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3222621
                    
                                            
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                                    Patent number 3,222,621
                                
 
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                                    Issue date Dec 7, 1965
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3202943
                    
                                            
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                                    Patent number 3,202,943
                                
 
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                                    Issue date Aug 24, 1965
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3064215
                    
                                            
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                                    Patent number 3,064,215
                                
 
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                                    Issue date Nov 13, 1962
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        3025493
                    
                                            
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                                    Patent number 3,025,493
                                
 
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                                    Issue date Mar 13, 1962
                                
 
                        
                                                                
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                                    G01 - MEASURING TESTING
                                 
                        
                 
             
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                        3007076
                    
                                            
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                                    Patent number 3,007,076
                                
 
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                                    Issue date Oct 31, 1961
                                
 
                        
                                                                
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                                    H04 - ELECTRIC COMMUNICATION TECHNIQUE
                                 
                        
                 
             
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                        2989624
                    
                                            
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                                    Patent number 2,989,624
                                
 
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                                    Issue date Jun 20, 1961
                                
 
                        
                                                                
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                                    H04 - ELECTRIC COMMUNICATION TECHNIQUE
                                 
                        
                 
             
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                        2987644
                    
                                            
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                                    Patent number 2,987,644
                                
 
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                                    Issue date Jun 6, 1961
                                
 
                        
                                                                
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                                    H04 - ELECTRIC COMMUNICATION TECHNIQUE
                                 
                        
                 
             
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                        2914739
                    
                                            
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                                    Patent number 2,914,739
                                
 
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                                    Issue date Nov 24, 1959
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2913725
                    
                                            
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                                    Patent number 2,913,725
                                
 
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                                    Issue date Nov 17, 1959
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2913724
                    
                                            
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                                    Patent number 2,913,724
                                
 
                                - 
                                    Issue date Nov 17, 1959
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2911599
                    
                                            
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                                    Patent number 2,911,599
                                
 
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                                    Issue date Nov 3, 1959
                                
 
                        
                                                                
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                                    H04 - ELECTRIC COMMUNICATION TECHNIQUE
                                 
                        
                 
             
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                        2909654
                    
                                            
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                                    Patent number 2,909,654
                                
 
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                                    Issue date Oct 20, 1959
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2876383
                    
                                            
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                                    Patent number 2,876,383
                                
 
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                                    Issue date Mar 3, 1959
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2874357
                    
                                            
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                                    Patent number 2,874,357
                                
 
                                - 
                                    Issue date Feb 17, 1959
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2864060
                    
                                            
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                                    Patent number 2,864,060
                                
 
                                - 
                                    Issue date Dec 9, 1958
                                
 
                        
                                                                
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                                    H03 - BASIC ELECTRONIC CIRCUITRY
                                 
                        
                 
             
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                        2863093
                    
                                            
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                                    Patent number 2,863,093
                                
 
                                - 
                                    Issue date Dec 2, 1958
                                
 
                        
                                                                
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                                    H04 - ELECTRIC COMMUNICATION TECHNIQUE
                                 
                        
                 
             
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                        2860340
                    
                                            
                                - 
                                    Patent number 2,860,340
                                
 
                                - 
                                    Issue date Nov 11, 1958
                                
 
                        
                                                                
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                                    G01 - MEASURING TESTING