CHASE, Circuit Judge.
The appellant is the owner of United States Patent No. 1,492,972 which was granted to him on May 6, 1924, upon his application filed December 5, 1911. The patent expired during the pendency of this suit. It is for "Dynamo Electric Machinery" described in the specifications which disclose a special homopolar dynamo that will operate as a generator to transform mechanical energy into direct electric current and will also, as will most dynamos,...
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