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US7455333 -  Nov 25, 2008 
US7445254 -  Nov 04, 2008 
US20080157541 -  Jul 03, 2008 
US7013688 -  Mar 21, 2006 
US7003990 -  Feb 28, 2006 
US6834895 -  Dec 28, 2004 
US6813915 -  Nov 09, 2004 
US20040189012 -  Sep 30, 2004 
US6357806 -  Mar 19, 2002 
US6354640 -  Mar 12, 2002 
US5794467 -  Aug 18, 1998 
US5688000 -  Nov 18, 1997 
US5613796 -  Mar 25, 1997