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                        3570582
                    
                                            
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                                    Patent number 3,570,582
                                
 
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                                    Issue date Mar 16, 1971
                                
 
                        
                                                                
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                        2446079
                    
                                            
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                                    Patent number 2,446,079
                                
 
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                                    Issue date Jul 27, 1948
                                
 
                        
                                                                
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                        2268772
                    
                                            
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                                    Patent number 2,268,772
                                
 
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                                    Issue date Jan 6, 1942
                                
 
                        
                                                                
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                        2058314
                    
                                            
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                                    Patent number 2,058,314
                                
 
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                                    Issue date Oct 20, 1936
                                
 
                        
                                                                
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                        2048001
                    
                                            
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                                    Patent number 2,048,001
                                
 
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                                    Issue date Jul 21, 1936
                                
 
                        
                                                                
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                        2041860
                    
                                            
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                                    Patent number 2,041,860
                                
 
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                                    Issue date May 26, 1936
                                
 
                        
                                                                
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                        1948129
                    
                                            
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                                    Patent number 1,948,129
                                
 
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                                    Issue date Feb 20, 1934
                                
 
                        
                                                                
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                        1720412
                    
                                            
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                                    Patent number 1,720,412
                                
 
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                                    Issue date Jul 9, 1929
                                
 
                        
                                                                
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                                    B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...