BONE, Circuit Judge.
York Corporation (herein called plaintiff) brought this action in the district court for a declaratory judgment that the McAdam patent, No. 2,219,393, issued October 29, 1940, was invalid and for an injunction restraining Refrigeration Engineering, Inc. (herein called defendant), owner of the patent, from bringing or prosecuting any action charging plaintiff with infringing the patent. Defendant filed an answer which contained a counter-claim...
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