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US20090174246 -  Jul 09, 2009 
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US7434863 -  Oct 14, 2008 
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US6997511 -  Feb 14, 2006 
US6913317 -  Jul 05, 2005 
US20050116520 -  Jun 02, 2005 
US6899385 -  May 31, 2005