HAMILTON, Circuit Judge.
This is an appeal by appellant, the W-R Company, from a decree of the District Court restraining it from the alleged infringement of appellee's mechanical patent number 1,571,813, for which he applied April 30, 1925, and which was issued February 2, 1926. The patent in suit relates to a fixture which appellee devised and attached to a piston ring grinding machine. His appliance removed the burr or wire edge from the periphery of the ring while...
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