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US6922953 -  Aug 02, 2005 
US6705306 -  Mar 16, 2004 
US6644601 -  Nov 11, 2003 
US6443413 -  Sep 03, 2002 
US5873552 -  Feb 23, 1999 
US5868222 -  Feb 09, 1999 
US5662429 -  Sep 02, 1997 
US5590863 -  Jan 07, 1997 
US5522685 -  Jun 04, 1996 
US5520360 -  May 28, 1996 
US5372287 -  Dec 13, 1994 
US5351926 -  Oct 04, 1994 
US5203393 -  Apr 20, 1993 
US5201488 -  Apr 13, 1993 
US5141197 -  Aug 25, 1992