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US7568582 -  Aug 04, 2009 
US20090152223 -  Jun 18, 2009 
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US20090152219 -  Jun 18, 2009 
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US7441668 -  Oct 28, 2008 
US20080083683 -  Apr 10, 2008 
US7275662 -  Oct 02, 2007 
US20070221593 -  Sep 27, 2007 
US7237686 -  Jul 03, 2007 
US7232038 -  Jun 19, 2007 
US20070119802 -  May 31, 2007