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US7036660 -  May 02, 2006 
US6938765 -  Sep 06, 2005 
US6886211 -  May 03, 2005 
US20040040577 -  Mar 04, 2004 
US6533516 -  Mar 18, 2003 
US5518114 -  May 21, 1996 
US5226534 -  Jul 13, 1993 
US5139167 -  Aug 18, 1992 
US4685564 -  Aug 11, 1987 
US4555030 -  Nov 26, 1985 
US4496047 -  Jan 29, 1985 
US4445610 -  May 01, 1984 
US4432452 -  Feb 21, 1984 
US4285428 -  Aug 25, 1981 
US4128172 -  Dec 05, 1978 
US4000832 -  Jan 04, 1977 
US3972417 -  Aug 03, 1976 
US3958692 -  May 25, 1976