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Back to SEISCO Highlights Return to  ANSWER TO QUESTION NUMBER 1 US Patent # 6,246,831 Issued June 12, 2001 US Patent # 6,080,971 Issued June 27, 2000 US Patent # 5,866,880 Issued Feb. 2,1999 US Patent # 5,325,822 Issued July 5, 1994 US Patent # 5,216,743 Issued June 1, 1993 Back to SEISCO Highlights Return to  ANSWER TO QUESTION NUMBER 1