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                        Magnetic window cleaning apparatus
                    
                                            
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                                    Patent number 4,977,637
                                
 
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                                    Issue date Dec 18, 1990
                                
 
                        
                                            
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                                    Rodney C. Demers
                                 
                        
                                            
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                        3778173
                    
                                            
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                                    Patent number 3,778,173
                                
 
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                                    Issue date Dec 11, 1973
                                
 
                        
                                                                
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                        3759621
                    
                                            
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                                    Patent number 3,759,621
                                
 
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                                    Issue date Sep 18, 1973
                                
 
                        
                                                                
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                        3201816
                    
                                            
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                                    Patent number 3,201,816
                                
 
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                                    Issue date Aug 24, 1965
                                
 
                        
                                                                
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                        2285412
                    
                                            
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                                    Patent number 2,285,412
                                
 
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                                    Issue date Jun 9, 1942
                                
 
                        
                                                                
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                                    A47 - FURNITURE DOMESTIC ARTICLES OR APPLIANCES COFFEE MILLS SPICE MILLS SUCT...