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US7455333 -  Nov 25, 2008 
US7437899 -  Oct 21, 2008 
US7384079 -  Jun 10, 2008 
US7334438 -  Feb 26, 2008 
US20070080542 -  Apr 12, 2007 
US7201407 -  Apr 10, 2007 
US6907830 -  Jun 21, 2005 
US6810699 -  Nov 02, 2004 
US6691462 -  Feb 17, 2004 
US6641182 -  Nov 04, 2003 
US6523870 -  Feb 25, 2003 
US6477810 -  Nov 12, 2002 
US6361086 -  Mar 26, 2002 
US6357806 -  Mar 19, 2002