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                        Vacuum moulding flask
                    
                                            
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                                    Patent number 4,567,932
                                
 
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                                    Issue date Feb 4, 1986
                                
 
                        
                                            
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                                    M.A.N.-ROLAND Druckmaschinen Aktiengesellschaft
                                 
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                                    Horst  Hollenbach
                                 
                        
                                            
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        3513905
                    
                                            
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                                    Patent number 3,513,905
                                
 
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                                    Issue date May 26, 1970
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        3429360
                    
                                            
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                                    Patent number 3,429,360
                                
 
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                                    Issue date Feb 25, 1969
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        3396045
                    
                                            
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                                    Patent number 3,396,045
                                
 
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                                    Issue date Aug 6, 1968
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        3010165
                    
                                            
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                                    Patent number 3,010,165
                                
 
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                                    Issue date Nov 28, 1961
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        2997755
                    
                                            
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                                    Patent number 2,997,755
                                
 
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                                    Issue date Aug 29, 1961
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        2876535
                    
                                            
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                                    Patent number 2,876,535
                                
 
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                                    Issue date Mar 10, 1959
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY
                                 
                        
                 
             
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                        2665461
                    
                                            
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                                    Patent number 2,665,461
                                
 
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                                    Issue date Jan 12, 1954
                                
 
                        
                                                                
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                                    B22 - CASTING POWDER METALLURGY