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                        Method for manufacturing ceramic filter
                    
                                            
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                                    Patent number 9,796,632
                                
 
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                                    Issue date Oct 24, 2017
                                
 
                        
                                            
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                                    Korea Institute of Industrial Technology
                                 
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                                    Myong Hwa Lee
                                 
                        
                                            
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                                    C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
                                 
                        
                 
             
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                        Soil conditioner
                    
                                            
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                                    Patent number 5,779,789
                                
 
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                                    Issue date Jul 14, 1998
                                
 
                        
                                            
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                                    Aisin Takaoka Co., Ltd.
                                 
                                - 
                                        
                                    Hayato  Kato
                                 
                        
                                            
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                                    C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
                                 
                        
                 
             
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                        3922411
                    
                                            
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                                    Patent number 3,922,411
                                
 
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                                    Issue date Nov 25, 1975
                                
 
                        
                                                                
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                                    C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES
                                 
                        
                 
             
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                        1960573
                    
                                            
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                                    Patent number 1,960,573
                                
 
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                                    Issue date May 29, 1934
                                
 
                        
                                                                
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                                    C04 - CEMENTS CONCRETE ARTIFICIAL STONE CERAMICS REFRACTORIES