FORMAN, District Judge.
Plaintiff filed an application for a patent on June 26, 1926, which was allowed on July 7, 1931, under number 1,813,334. The purpose of the invention as recited in the patent "is to provide a single control for both the filament and plate batteries of an audion circuit, whereby the filaments may be lighted prior to the circuit on the plate being closed, so that reactivation of the audion may take place without removal from its normal position...
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