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                        3644553
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                                    Patent number 3,644,553
                                
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                                    Issue date Feb 22, 1972
                                
 
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                        3636177
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                                    Patent number 3,636,177
                                
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                                    Issue date Jan 18, 1972
                                
 
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                        3562347
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                                    Patent number 3,562,347
                                
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                                    Issue date Feb 9, 1971
                                
 
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                        3534115
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                                    Patent number 3,534,115
                                
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                                    Issue date Oct 13, 1970
                                
 
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                        3506730
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                                    Patent number 3,506,730
                                
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                                    Issue date Apr 14, 1970
                                
 
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                        3504045
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                                    Patent number 3,504,045
                                
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                                    Issue date Mar 31, 1970
                                
 
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                        3480688
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                                    Patent number 3,480,688
                                
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                                    Issue date Nov 25, 1969
                                
 
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                        3458587
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                                    Patent number 3,458,587
                                
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                                    Issue date Jul 29, 1969
                                
 
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                        3394202
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                                    Patent number 3,394,202
                                
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                                    Issue date Jul 23, 1968
                                
 
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                        3301916
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                                    Patent number 3,301,916
                                
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                                    Issue date Jan 31, 1967
                                
 
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                        3219719
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                                    Patent number 3,219,719
                                
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                                    Issue date Nov 23, 1965
                                
 
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                        3201494
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                                    Patent number 3,201,494
                                
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                                    Issue date Aug 17, 1965
                                
 
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                        3172918
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                                    Patent number 3,172,918
                                
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                                    Issue date Mar 9, 1965
                                
 
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                                    Patent number 3,109,036
                                
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                                    Issue date Oct 29, 1963
                                
 
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                        2918505
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                                    Issue date Dec 22, 1959
                                
 
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                        2885451
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                                    Patent number 2,885,451
                                
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                                    Issue date May 5, 1959
                                
 
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                        2848517
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                                    Patent number 2,848,517
                                
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                                    Issue date Aug 19, 1958
                                
 
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                        2784242
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                                    Patent number 2,784,242
                                
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                                    Issue date Mar 5, 1957
                                
 
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                        2773916
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                                    Patent number 2,773,916
                                
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                                    Issue date Dec 11, 1956
                                
 
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                        2768983
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                                    Patent number 2,768,983
                                
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                                    Issue date Oct 30, 1956
                                
 
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                        2741647
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                                    Patent number 2,741,647
                                
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                                    Issue date Apr 10, 1956
                                
 
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                        2662925
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                                    Patent number 2,662,925
                                
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                                    Issue date Dec 15, 1953
                                
 
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