SWYGERT, Circuit Judge.
The defendant, National Automatic Tool Company, Inc., an Indiana corporation, appeals from a judgment of the district court in an action for patent infringement brought by the plaintiff, Koehring Company, a Wisconsin corporation, as the owner by assignment of United States Letters Patent No. 3,084,512. The district court held Koehring's patent valid and infringed by National.
Both Koehring and National are engaged in the manufacture...
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