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US7322467 -  Jan 29, 2008 
US6938765 -  Sep 06, 2005 
US6793070 -  Sep 21, 2004 
US6612457 -  Sep 02, 2003 
US20030025057 -  Feb 06, 2003 
US20010050283 -  Dec 13, 2001 
US6273289 -  Aug 14, 2001 
US6213333 -  Apr 10, 2001 
US5899420 -  May 04, 1999 
US5601190 -  Feb 11, 1997 
US5597087 -  Jan 28, 1997 
US5294194 -  Mar 15, 1994 
US5236340 -  Aug 17, 1993 
US5064090 -  Nov 12, 1991 
US4993583 -  Feb 19, 1991 
US4854466 -  Aug 08, 1989 
US4629153 -  Dec 16, 1986 
US4606523 -  Aug 19, 1986 
US3944108 -  Mar 16, 1976 
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