DAWSON, District Judge.
This is a motion made by the defendants under Rule 56 of the Rules of Civil Procedure, 28 U.S.C.A. for summary judgment dismissing the complaint. The action is one for patent infringement. In the answer the defendants allege, as part of an affirmative defense, that "plaintiff is not entitled to any relief or recovery based on alleged infringement of United States Letters Patent No. 2,597,912 because it has been employed, and is being employed...
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