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                        Solenoid valve and method for its manufacture
                    
                                            
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                                    Patent number 5,911,400
                                
 
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                                    Issue date Jun 15, 1999
                                
 
                        
                                            
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                                    Hydraulik-Ring Antriebs- und Steuerungstechnik GmbH
                                 
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                                    Bernd  Niethammer
                                 
                        
                                            
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                                    F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
                                 
                        
                 
             
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                        Apparatus for tensioning of a cam shaft drive
                    
                                            
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                                    Patent number 5,597,367
                                
 
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                                    Issue date Jan 28, 1997
                                
 
                        
                                            
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                                    Hydraulik-Ring Antriebs- und Steuerungstechnik GmbH
                                 
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                                    Alfred  Trzmiel
                                 
                        
                                            
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                                    F02 - COMBUSTION ENGINES HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
                                 
                        
                 
             
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                        Electroproportional solenoid valve unit
                    
                                            
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                                    Patent number 5,592,972
                                
 
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                                    Issue date Jan 14, 1997
                                
 
                        
                                            
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                                    Hydraulik-Ring Antriebs- und Steuerungstechnik GmbH
                                 
                                - 
                                        
                                    Bernd  Niethammer
                                 
                        
                                            
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                                    F15 - FLUID-PRESSURE ACTUATORS HYDRAULICS OR PNEUMATICS IN GENERAL
                                 
                        
                 
             
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                        Proportional magnet valve
                    
                                            
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                                    Patent number 5,322,259
                                
 
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                                    Issue date Jun 21, 1994
                                
 
                        
                                            
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                                    Hydraulik-Ring Antriebs- und Steuerungstechnik GmbH
                                 
                                - 
                                        
                                    Axel  Sauer
                                 
                        
                                            
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                                    F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
                                 
                        
                 
             
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                        Clutch for vehicles
                    
                                            
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                                    Patent number 5,301,781
                                
 
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                                    Issue date Apr 12, 1994
                                
 
                        
                                            
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                                    Hydraulik-Ring Antriebs- und Steuerungstechnik GmbH
                                 
                                - 
                                        
                                    Dieter  Tischer
                                 
                        
                                            
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                                    F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...