DENISON, Circuit Judge.
The appellant's infringement bill, based upon the Nace patent, No. 1,192,673, July 15, 1916, for an anti-skidding device, was dismissed by the District Court for the reason that the device did not disclose patentable invention.
The device consists essentially of a series of independent short chains, each adapted to encircle the wheel rim and tire of an automobile, and particularly the large tire of a truck. One end of the chain carries...
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