CELEBREZZE, Circuit Judge.
Skega Aktiebolag and its licensee, the Allen Pump Company [hereinafter "Appellants"], filed this action in the United States District Court for the Northern District of Ohio, Eastern Division, complaining that the B. F. Goodrich Company [hereinafter "Appellee"] had infringed the Appellants' patent on a lining for a rotary ball mill. The Appellee counterclaimed for a declaration that the patent was invalid. 35 U.S.C. § 103 (1952). After...
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