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US20040036846 -  Feb 26, 2004 
US6115106 -  Sep 05, 2000 
US6071023 -  Jun 06, 2000 
US5926256 -  Jul 20, 1999 
US5717442 -  Feb 10, 1998 
US5469241 -  Nov 21, 1995 
US5406350 -  Apr 11, 1995 
US5400152 -  Mar 21, 1995 
US5247330 -  Sep 21, 1993 
US5202724 -  Apr 13, 1993 
US5173731 -  Dec 22, 1992 
US5166726 -  Nov 24, 1992 
US5061955 -  Oct 29, 1991 
US5051774 -  Sep 24, 1991 
US5031773 -  Jul 16, 1991 
US4975733 -  Dec 04, 1990 
US4969009 -  Nov 06, 1990 
US4918485 -  Apr 17, 1990