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US20090223999 -  Sep 10, 2009 
US7537112 -  May 26, 2009 
US20090120891 -  May 14, 2009 
US20090039045 -  Feb 12, 2009 
US20080142465 -  Jun 19, 2008 
US7252676 -  Aug 07, 2007