This is an action in equity in which plaintiff seeks to restrain the alleged infringement by the defendant of patent No. 1,271,527, issued to Marcus C. Hopkins, for sound-regenerating machine, dated July 2, 1918, and patent No. 1,271,529, issued to Marcus C. Hopkins, for acoustic device, dated July 2, 1918, both of which were by mesne assignments assigned to the plaintiff, and for damages.
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