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US7441812 -  Oct 28, 2008 
US6672632 -  Jan 06, 2004 
US6607221 -  Aug 19, 2003 
US5150934 -  Sep 29, 1992 
US5071176 -  Dec 10, 1991 
US4928615 -  May 29, 1990 
US4911489 -  Mar 27, 1990 
US4893849 -  Jan 16, 1990 
US4880261 -  Nov 14, 1989 
US4852193 -  Aug 01, 1989 
US4678212 -  Jul 07, 1987 
US4639021 -  Jan 27, 1987 
US4533165 -  Aug 06, 1985 
US4428608 -  Jan 31, 1984 
US4303264 -  Dec 01, 1981