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US7604980 -  Oct 20, 2009 
US7582465 -  Sep 01, 2009 
US7560107 -  Jul 14, 2009 
US7557079 -  Jul 07, 2009 
US7507403 -  Mar 24, 2009 
US7473544 -  Jan 06, 2009 
US7374923 -  May 20, 2008 
US7329529 -  Feb 12, 2008 
US7291495 -  Nov 06, 2007 
US7282579 -  Oct 16, 2007 
US7276365 -  Oct 02, 2007 
US7273743 -  Sep 25, 2007