JERTBERG, Circuit Judge.
In the district court appellant, as owner of United States letters patent No. 2,552,673 issued May 15, 1951, sought recovery of damages against the appellees for alleged infringement of patent, for injunctive relief, and for declaration of validity of said patent. Appellees denied the validity of appellant's patent and infringement thereof, and counterclaimed for damages alleged to have resulted from notices sent by appellant to appellees...
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