CHASE, Circuit Judge.
The plaintiff is the owner by assignment of United States patent No. 1,318,670, issued October 14, 1919, to Horace Hull, for selective signaling apparatus. It alleged in the bill of complaint that this patent had been infringed by the defendant's selective signaling apparatus, and the proof centered upon the defendant's train dispatching system as the offender.
Hull made three applications for a patent. The first, dated January 11, 1912...
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