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US7604581 -  Oct 20, 2009 
US7601407 -  Oct 13, 2009 
US7588477 -  Sep 15, 2009 
US7572166 -  Aug 11, 2009 
US20090191787 -  Jul 30, 2009 
US7476141 -  Jan 13, 2009 
US7475442 -  Jan 13, 2009 
US20080311820 -  Dec 18, 2008 
US20080153382 -  Jun 26, 2008 
US20080125004 -  May 29, 2008 
US20080051003 -  Feb 28, 2008 
US7335109 -  Feb 26, 2008 
US7335083 -  Feb 26, 2008 
US20080032590 -  Feb 07, 2008 
US20080032589 -  Feb 07, 2008 
US7320529 -  Jan 22, 2008 
US7311581 -  Dec 25, 2007 
US20070275633 -  Nov 29, 2007