Gallery›Digital Commonwealth — Boston Public Library›Will B. "Pop" Brown made 1st diaphragm for telephone Bell-Telg.
Will B. "Pop" Brown made 1st diaphragm for telephone Bell-Telg.
Digital Commonwealth — Boston Public Library

Will B. "Pop" Brown made 1st diaphragm for telephone Bell-Telg.

Sanromá, John B., 1900-1997 · April 4, 1935

CC0 — Public Domain
Digital Commonwealth — Boston Public Library
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