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US7607854 -  Oct 27, 2009 
US20080298885 -  Dec 04, 2008 
US7445399 -  Nov 04, 2008 
US20080197257 -  Aug 21, 2008 
US20070258754 -  Nov 08, 2007 
US20070166097 -  Jul 19, 2007 
US7243892 -  Jul 17, 2007 
US20060285916 -  Dec 21, 2006 
US7140685 -  Nov 28, 2006 
US20040234330 -  Nov 25, 2004 
US6814522 -  Nov 09, 2004 
US6709183 -  Mar 23, 2004 
US6591849 -  Jul 15, 2003 
USRE38075 -  Apr 15, 2003 
US6478500 -  Nov 12, 2002 
US6421965 -  Jul 23, 2002