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US7413056 -  Aug 19, 2008 
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US7331425 -  Feb 19, 2008 
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US20050092975 -  May 05, 2005 
US6854715 -  Feb 15, 2005 
US6772861 -  Aug 10, 2004 
US6742768 -  Jun 01, 2004 
US20040069979 -  Apr 15, 2004 
US6679479 -  Jan 20, 2004 
US20030168646 -  Sep 11, 2003 
US6607181 -  Aug 19, 2003 
US6604722 -  Aug 12, 2003 
US6601826 -  Aug 05, 2003 
US6527251 -  Mar 04, 2003