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US20080296542 -  Dec 04, 2008 
US7350255 -  Apr 01, 2008 
US7331544 -  Feb 19, 2008 
US7278627 -  Oct 09, 2007 
US7222838 -  May 29, 2007 
US7194779 -  Mar 27, 2007 
US7104524 -  Sep 12, 2006 
US7100232 -  Sep 05, 2006 
US7003836 -  Feb 28, 2006 
US6945514 -  Sep 20, 2005 
US6935619 -  Aug 30, 2005 
US6880194 -  Apr 19, 2005 
US20040046160 -  Mar 11, 2004 
US6648300 -  Nov 18, 2003 
US20030094601 -  May 22, 2003 
US6517051 -  Feb 11, 2003 
US6439543 -  Aug 27, 2002 
US20020096670 -  Jul 25, 2002