MEMORANDUM
COSTANTINO, District Judge.
Koppers Company, Inc. and Universal Corrugated Box Machinery Corporation commenced this action on July 24, 1970 for a declaratory judgment that United States Letters Patent No. 2,988,236 issued June 13, 1961 to A. F. Shields for an invention entitled "Blank Stacking, Straightening and Delivery Device" [hereinafter referred to as Shields Patent] and assigned to defendant,...
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