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US20090253338 -  Oct 08, 2009 
US20090176436 -  Jul 09, 2009 
US20090176435 -  Jul 09, 2009 
US20090081916 -  Mar 26, 2009 
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US20080287031 -  Nov 20, 2008 
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USRE40533 -  Oct 07, 2008 
US20080064289 -  Mar 13, 2008 
US7294036 -  Nov 13, 2007 
US7270588 -  Sep 18, 2007 
US20070099535 -  May 03, 2007 
US20070077851 -  Apr 05, 2007 
US7198536 -  Apr 03, 2007 
US20070026758 -  Feb 01, 2007 
US7144292 -  Dec 05, 2006 
US20060234596 -  Oct 19, 2006 
US20060194504 -  Aug 31, 2006 
US20060189246 -  Aug 24, 2006 
US7029359 -  Apr 18, 2006 
US6991508 -  Jan 31, 2006 
US20050287902 -  Dec 29, 2005 
US20050239366 -  Oct 27, 2005 
US20050197037 -  Sep 08, 2005 
US6939191 -  Sep 06, 2005 
US6908360 -  Jun 21, 2005 
US6908359 -  Jun 21, 2005 
US6905387 -  Jun 14, 2005 
US6899587 -  May 31, 2005