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US7603818 -  Oct 20, 2009 
US7051988 -  May 30, 2006 
US20020088186 -  Jul 11, 2002 
US6247273 -  Jun 19, 2001 
US6176057 -  Jan 23, 2001 
US5956906 -  Sep 28, 1999 
US5660006 -  Aug 26, 1997 
US5481836 -  Jan 09, 1996 
US5228262 -  Jul 20, 1993 
US4815408 -  Mar 28, 1989 
US4272933 -  Jun 16, 1981 
US4098037 -  Jul 04, 1978 
US4079556 -  Mar 21, 1978 
US4070833 -  Jan 31, 1978 
US4068426 -  Jan 17, 1978