United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 339
containing shellac sepalateaoy two subscribing witnesses_^_ containing su«iiii«-, ^^i*--^—j terial in disk form and by thermoplasticmaterial, and impressing sound recordhooves into both layers of gramophone ma-iTerial while the latter and the intermediatethermoplastic material are softened by heat.… … 6 3 7^ Attest: Inventor: I o«i>»»M CO- ™illO-l.«U<J««l*e« V.AW1H0T0II 0 c UNITED STATES PATENT OFFICE. EDWARD L. AIKEN, OF EAST ORANGE, NEW JERSEY, ASSIGNOR TO NEW JERSEY PATENT COMPANY, OF WEST ORANGE, NEW JERSEY, A CORPORATION OF NEW JERSEY. PHONOGRAPH-RECORD MOLD. 956,933. Specification of…
Phonograph · Patents
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