WILKIN, District Judge.
The complaint charges infringement of United States letters patent No. 2,134,143. The answer denies infringement and alleges invalidity because of lack of invention, and anticipation. The accused device is an industrial ventilator made and sold by the defendant to Goodyear Tire & Rubber Company and installed at its Akron plant. The patented and the accused ventilators were designed for installation on the roof of a building so as to emit...
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