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US7442121 -  Oct 28, 2008 
US7238106 -  Jul 03, 2007 
US7022011 -  Apr 04, 2006 
US6899615 -  May 31, 2005 
US6843717 -  Jan 18, 2005 
US6669552 -  Dec 30, 2003 
US6626754 -  Sep 30, 2003 
US5404865 -  Apr 11, 1995 
US5165732 -  Nov 24, 1992 
US5111739 -  May 12, 1992 
US5094273 -  Mar 10, 1992 
US5007249 -  Apr 16, 1991 
US4735235 -  Apr 05, 1988