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AcceptU.S. Patent 5,321,257
U.S. Patent 5,633,494
Canadian Patent 2,073,162
U.S. Patent 6,127,672, 6,563,107
U.S. Patent 6,127,672, 6,563,107
U.S. Patent 7,296,363
Canadian Patent 2,472,421
U.S. Patent 7,296,363
Canadian Patent 2,472,421
Canadian application 2,815,199 & 2,815,195
Cyclical Sensor Array, Canadian application 2,815,199 & 2,911,175