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                        Valve
                    
                                            
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                                    Patent number 11,131,391
                                
 
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                                    Issue date Sep 28, 2021
                                
 
                        
                                            
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                                    OTRAJET INC.
                                 
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                                    Ching-Hao  Chen
                                 
                        
                                            
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                                    B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
                                 
                        
                 
             
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                        3902704
                    
                                            
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                                    Patent number 3,902,704
                                
 
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                                    Issue date Sep 2, 1975
                                
 
                        
                                                                
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                                    B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
                                 
                        
                 
             
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                        3780995
                    
                                            
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                                    Patent number 3,780,995
                                
 
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                                    Issue date Dec 25, 1973
                                
 
                        
                                                                
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                                    B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
                                 
                        
                 
             
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                        3728053
                    
                                            
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                                    Patent number 3,728,053
                                
 
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                                    Issue date Apr 17, 1973
                                
 
                        
                                                                
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                                    B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL