MICHEL, Circuit Judge.
The A.B. Chance Company ("Chance") appeals the decision of the United States District Court for the Eastern District of Missouri finding claims 1 through 4 and claims 6 through 8 of U.S. Patent Nos. 5,139,368 ("the '368 patent") and 5,171,107 ("the '107 patent") invalid for obviousness under 35 U.S.C. § 103 (1999). On cross-appeal, Richard Ruiz and Foundation Anchoring Systems, Inc. (a/k/a "Fasteel") argue that the district court erred...
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