SPARKS, Circuit Judge.
Appellant charged appellee with infringement of United States patent No. 1,570,032 to Baldner, issued January 19, 1926, on an application filed June 7, 1921. This bill also charged appellee with infringement, and the inequitable appropriation, of United States improvement patent No. 1,980,117 to Clapp and Eickhoff. Both of these patents were owned by appellant at all times here in question. The defenses were invalidity and non-infringement....
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