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US7117626 -  Oct 10, 2006 
US6615531 -  Sep 09, 2003 
US6527647 -  Mar 04, 2003 
US6370787 -  Apr 16, 2002 
US5644853 -  Jul 08, 1997 
US5570513 -  Nov 05, 1996 
US5375337 -  Dec 27, 1994 
US5351407 -  Oct 04, 1994 
US5301436 -  Apr 12, 1994 
US5233124 -  Aug 03, 1993 
US4596229 -  Jun 24, 1986 
US4594786 -  Jun 17, 1986 
US4398354 -  Aug 16, 1983 
US4382339 -  May 10, 1983