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US20090056597 -  Mar 05, 2009 
US7439694 -  Oct 21, 2008 
US20080250989 -  Oct 16, 2008 
US7311048 -  Dec 25, 2007 
US20070266913 -  Nov 22, 2007 
US7077068 -  Jul 18, 2006 
US20050252429 -  Nov 17, 2005