JOHN B. SANBORN, District Judge.
The bill of complaint charges infringement of Howe patent, No. 1,551,515, and the answer sets up the defenses of lack of invention and noninfringement.
The plaintiff complains of the installation of an automatic train-control system by the defendant, made by the Sprague Safety Control & Signal Corporation; that company has indemnified the railroad against loss by virtue of any patent litigation and has assumed the defense...
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