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                        Manufacture of roof tiles
                    
                                            
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                                    Patent number 6,071,448
                                
 
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                                    Issue date Jun 6, 2000
                                
 
                        
                                            
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                                    Bhushan Kumar Oberoi
                                 
                        
                                            
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        Moulding pallet
                    
                                            
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                                    Patent number 4,832,309
                                
 
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                                    Issue date May 23, 1989
                                
 
                        
                                            
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                                    Gerald  Derby-Lewis
                                 
                        
                                            
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        2870512
                    
                                            
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                                    Patent number 2,870,512
                                
 
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                                    Issue date Jan 27, 1959
                                
 
                        
                                                                
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        2636243
                    
                                            
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                                    Patent number 2,636,243
                                
 
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                                    Issue date Apr 28, 1953
                                
 
                        
                                                                
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        2496078
                    
                                            
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                                    Patent number 2,496,078
                                
 
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                                    Issue date Jan 31, 1950
                                
 
                        
                                                                
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        2282891
                    
                                            
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                                    Patent number 2,282,891
                                
 
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                                    Issue date May 12, 1942
                                
 
                        
                                                                
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        2206803
                    
                                            
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                                    Patent number 2,206,803
                                
 
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                                    Issue date Jul 2, 1940
                                
 
                        
                                                                
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                                    B28 - WORKING CEMENT, CLAY, OR STONE
                                 
                        
                 
             
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                        2098382
                    
                                            
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                                    Patent number 2,098,382
                                
 
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                                    Issue date Nov 9, 1937
                                
 
                        
                                                                
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                                    B28 - WORKING CEMENT, CLAY, OR STONE