SWYGERT, Circuit Judge.
This case concerns the validity of U.S. Patent No. 3,991,831 (Foster) covering the invention of a harrow used in cultivating ground for agriculture purposes. Lee Blacksmith, Inc. ("Blacksmith"), the owner of the patent brought this action against Lindsay Brothers, Inc. ("Lindsay") for inducing infringement. Lindsay counterclaimed alleging invalidity of the patent under 35 U.S.C. § 102(b) ("on sale" bar) and 35 U.S.C. § 103 (obviousness...
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