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                        Method for manufacturing turbo fan
                    
                                            
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                                    Patent number 11,448,077
                                
 
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                                    Issue date Sep 20, 2022
                                
 
                        
                                            
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                                    Denso Corporation
                                 
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                                    Fumiya  Ishii
                                 
                        
                                            
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                        Method and apparatus for spot welding
                    
                                            
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                                    Patent number 5,541,382
                                
 
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                                    Issue date Jul 30, 1996
                                
 
                        
                                            
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                                    Reynolds Metals Company
                                 
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                                    Glen A. Taylor
                                 
                        
                                            
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                        3790738
                    
                                            
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                                    Patent number 3,790,738
                                
 
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                                    Issue date Feb 5, 1974
                                
 
                        
                                                                
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                        3765589
                    
                                            
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                                    Patent number 3,765,589
                                
 
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                                    Issue date Oct 16, 1973
                                
 
                        
                                                                
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                        3410983
                    
                                            
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                                    Patent number 3,410,983
                                
 
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                                    Issue date Nov 12, 1968
                                
 
                        
                                                                
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                        3016450
                    
                                            
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                                    Patent number 3,016,450
                                
 
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                                    Issue date Jan 9, 1962
                                
 
                        
                                                                
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                        2847556
                    
                                            
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                                    Patent number 2,847,556
                                
 
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                                    Issue date Aug 12, 1958
                                
 
                        
                                                                
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                        2846563
                    
                                            
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                                    Patent number 2,846,563
                                
 
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                                    Issue date Aug 5, 1958
                                
 
                        
                                                                
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                                    B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
                                 
                        
                 
             
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                        2558041
                    
                                            
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                                    Patent number 2,558,041
                                
 
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                                    Issue date Jun 26, 1951
                                
 
                        
                                                                
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                        2222906
                    
                                            
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                                    Patent number 2,222,906
                                
 
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                                    Issue date Nov 26, 1940
                                
 
                        
                                                                
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                                    B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR