United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 763
n the surface of therecord a film of the vapor of gold, then10 backing up the metal film, and then sep- arating the negative matrix from the orig-inal record, substantially as described. In witness Avhereof, I have signed myname to this specification in the presence oftwo subscribing witnesses.… … ^^^
Phonograph · Patents
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