Hungarian-American engineer (1906-1977) who, during his time with Columbia Records, was instrumental in developing the long-playing microgroove 331⁄3 rpm phonograph disc. Glossy 5 x 7 photo of the gramophone record pioneer, signed in blue ballpoint by Peter Carl Goldmark. In fine condition, with a vertical crease to right edge and a faint paperclip impression to top edge.
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