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US20090266813 -  Oct 29, 2009 
US20090178946 -  Jul 16, 2009 
US20090159596 -  Jun 25, 2009 
US20090145904 -  Jun 11, 2009 
US20090090719 -  Apr 09, 2009 
US7483837 -  Jan 27, 2009 
US20090000980 -  Jan 01, 2009 
US20080173650 -  Jul 24, 2008 
US20080163965 -  Jul 10, 2008