United States. Patent Office · Washington, D.C., Govt. Print. Off. · leaf 154
riginal record upon aphonogram; second, constructing a matrixor mold of such original record by depositingthereon a coating of metal by vaporizingmetal in a vacuum in which the record isplaced, and, third, producing duplicate phono-grams from such matrix, substantiallv as setforth. This…
Phonograph · Patents
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