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US7606018 -  Oct 20, 2009 
US7522399 -  Apr 21, 2009 
US7483252 -  Jan 27, 2009 
US7477503 -  Jan 13, 2009 
US7400485 -  Jul 15, 2008 
US7397646 -  Jul 08, 2008 
US7312970 -  Dec 25, 2007 
US6754057 -  Jun 22, 2004 
US6731489 -  May 04, 2004