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US7437899 -  Oct 21, 2008 
US7159908 -  Jan 09, 2007 
US6802543 -  Oct 12, 2004 
US6799396 -  Oct 05, 2004 
US6511105 -  Jan 28, 2003 
US6502868 -  Jan 07, 2003 
US6446393 -  Sep 10, 2002 
US6290268 -  Sep 18, 2001 
US6161881 -  Dec 19, 2000 
US6012747 -  Jan 11, 2000 
US5884948 -  Mar 23, 1999 
USRE35463 -  Feb 25, 1997 
US5308126 -  May 03, 1994 
US5201555 -  Apr 13, 1993 
US5117665 -  Jun 02, 1992 
US5087087 -  Feb 11, 1992 
US5069491 -  Dec 03, 1991 
US5014959 -  May 14, 1991 
US4986577 -  Jan 22, 1991 
US4896906 -  Jan 30, 1990 
US4819976 -  Apr 11, 1989 
US4807914 -  Feb 28, 1989