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US20080137338 -  Jun 12, 2008 
US7347410 -  Mar 25, 2008 
US7163087 -  Jan 16, 2007 
US7066448 -  Jun 27, 2006 
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US6974123 -  Dec 13, 2005 
US6929248 -  Aug 16, 2005 
US6926254 -  Aug 09, 2005 
US6769668 -  Aug 03, 2004 
US6742768 -  Jun 01, 2004 
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US6547217 -  Apr 15, 2003 
US6530559 -  Mar 11, 2003 
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US6474626 -  Nov 05, 2002 
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US6457700 -  Oct 01, 2002 
US6443430 -  Sep 03, 2002 
US6375161 -  Apr 23, 2002 
US6371247 -  Apr 16, 2002 
US6345807 -  Feb 12, 2002 
US6276665 -  Aug 21, 2001 
US20010004110 -  Jun 21, 2001 
US6213451 -  Apr 10, 2001 
US6070856 -  Jun 06, 2000 
US6068239 -  May 30, 2000 
US5915671 -  Jun 29, 1999