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US20090184028 -  Jul 23, 2009 
US7500564 -  Mar 10, 2009 
US20080302700 -  Dec 11, 2008 
US7370764 -  May 13, 2008 
US7347329 -  Mar 25, 2008 
US7334691 -  Feb 26, 2008 
US20070187288 -  Aug 16, 2007