BUFFINGTON, Circuit Judge.
In the court below the General Talking Pictures Corporation and the De Forest Phonofilms, Inc., hereafter called plaintiffs, owners of patent No. 1,607,480, granted November 16, 1926, to Elias E. Ries for method of reproducing photographic sound records, and three others, viz., No. 1,693,071, granted November 27, 1928, to Lee De Forest for a sound-recording attachment for motion picture cameras; No. 1,466,701, granted September 4, 1923,...
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