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US7296698 -  Nov 20, 2007 
US6986422 -  Jan 17, 2006 
US6938765 -  Sep 06, 2005 
US6726032 -  Apr 27, 2004 
US20030234228 -  Dec 25, 2003 
US6651827 -  Nov 25, 2003 
US6585117 -  Jul 01, 2003 
US6578718 -  Jun 17, 2003 
US6533130 -  Mar 18, 2003 
US6533118 -  Mar 18, 2003 
US6467780 -  Oct 22, 2002