BINGHAM, Circuit Judge.
This is a suit in equity alleging infringement of United States letters patent No. 1,855,168, issued April 19, 1932, to Clair L. Farrand, on a divisional application filed October 17, 1929, the original application having been filed April 22, 1926. The Lektophone Corporation, assignee of this patent, is one of the plaintiffs, and the Utah Radio Products Company, a licensee under it, is the other plaintiff.
The defenses are invalidity...
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