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US7543422 -  Jun 09, 2009 
US7490440 -  Feb 17, 2009 
US7448598 -  Nov 11, 2008 
US7377048 -  May 27, 2008 
US7310917 -  Dec 25, 2007 
US7254920 -  Aug 14, 2007 
US20070175174 -  Aug 02, 2007 
US20060260220 -  Nov 23, 2006 
US20060260219 -  Nov 23, 2006 
US20060207215 -  Sep 21, 2006 
US7021606 -  Apr 04, 2006 
US6976339 -  Dec 20, 2005 
US6944994 -  Sep 20, 2005