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US7503826 -  Mar 17, 2009 
US20090039207 -  Feb 12, 2009 
US20080274663 -  Nov 06, 2008 
US20080014826 -  Jan 17, 2008 
US20070037468 -  Feb 15, 2007 
US20060292964 -  Dec 28, 2006 
US20060211329 -  Sep 21, 2006 
US7101249 -  Sep 05, 2006 
US6962309 -  Nov 08, 2005 
US6905387 -  Jun 14, 2005 
US6896225 -  May 24, 2005 
US20050070197 -  Mar 31, 2005 
US20040224600 -  Nov 11, 2004 
US6811460 -  Nov 02, 2004 
US20040102130 -  May 27, 2004 
US6679748 -  Jan 20, 2004 
US20030232565 -  Dec 18, 2003 
US20030162469 -  Aug 28, 2003 
US20030068954 -  Apr 10, 2003