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US7549233 -  Jun 23, 2009 
US7458164 -  Dec 02, 2008 
US7373721 -  May 20, 2008 
US7346993 -  Mar 25, 2008 
US7316071 -  Jan 08, 2008 
US7290344 -  Nov 06, 2007 
US7096593 -  Aug 29, 2006