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US20090126115 -  May 21, 2009 
US7484254 -  Feb 03, 2009 
US20080134435 -  Jun 12, 2008 
US7318625 -  Jan 15, 2008 
US7246389 -  Jul 24, 2007 
US7171708 -  Feb 06, 2007 
US20060162078 -  Jul 27, 2006 
US7058998 -  Jun 13, 2006 
US7007327 -  Mar 07, 2006 
US6971131 -  Dec 06, 2005