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US6981832 -  Jan 03, 2006 
US6779567 -  Aug 24, 2004 
US5735321 -  Apr 07, 1998 
US5711427 -  Jan 27, 1998 
US5302073 -  Apr 12, 1994 
US5098245 -  Mar 24, 1992 
US4957221 -  Sep 18, 1990 
US4652199 -  Mar 24, 1987