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US20090211197 -  Aug 27, 2009 
US20090193754 -  Aug 06, 2009 
US20090188205 -  Jul 30, 2009 
US20090183464 -  Jul 23, 2009 
US20090173035 -  Jul 09, 2009 
US7543789 -  Jun 09, 2009 
US7490447 -  Feb 17, 2009 
US20080241294 -  Oct 02, 2008