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US7421816 -  Sep 09, 2008 
US20070137090 -  Jun 21, 2007 
US20060254116 -  Nov 16, 2006 
US7100321 -  Sep 05, 2006 
US6988331 -  Jan 24, 2006 
US20050195385 -  Sep 08, 2005 
US20040079018 -  Apr 29, 2004 
US6615531 -  Sep 09, 2003 
US20030163943 -  Sep 04, 2003 
US4920654 -  May 01, 1990 
US4734990 -  Apr 05, 1988 
US4016652 -  Apr 12, 1977