SPARKS, Circuit Judge.
Appellee charged appellant with infringement of United States patent to Kiefer, No. 1,880,257, issued October 4, 1932, on an application filed July 21, 1930. The defenses were invalidity and non-infringement, and appellant also filed a counterclaim in which it charged appellee with infringement of United States patent No. 2,072,344 to Risser, issued March 2, 1937, to appellant as assignee, on an application filed September 14, 1934. Appellee...
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