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                        3732433
                    
                                            
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                                    Patent number 3,732,433
                                
 
                                - 
                                    Issue date May 8, 1973
                                
 
                        
                                                                
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                                    F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
                                 
                        
                 
             
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                        3443752
                    
                                            
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                                    Patent number 3,443,752
                                
 
                                - 
                                    Issue date May 13, 1969
                                
 
                        
                                                                
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                                    F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
                                 
                        
                 
             
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                        2581522
                    
                                            
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                                    Patent number 2,581,522
                                
 
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                                    Issue date Jan 8, 1952
                                
 
                        
                                                                
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                                    F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES
                                 
                        
                 
             
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                        2573661
                    
                                            
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                                    Patent number 2,573,661
                                
 
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                                    Issue date Oct 30, 1951
                                
 
                        
                                                                
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                                    G05 - CONTROLLING REGULATING
                                 
                        
                 
             
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                        2482739
                    
                                            
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                                    Patent number 2,482,739
                                
 
                                - 
                                    Issue date Sep 20, 1949
                                
 
                        
                                                                
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                                    F23 - COMBUSTION APPARATUS COMBUSTION PROCESSES