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1636 - Atwater Kent F. Detalle de electroimánes, imán permanente y lengüeta metálica de la unidad reproducción (2), 1924
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783 - Sound of Speech. Bell Telephone Laboratories. Crandall (1), 1925
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783 - Sound of Speech. Bell Telephone Laboratories. Crandall (2), 1925
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783 - Sound of Speech. Bell Telephone Laboratories. Crandall (3), 1925
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665 - Artificial Throat Returns Speech to Cancer Sufferers. Popular Science, 1925
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367 - An Artificial Larynx. Riesz (1), 1930
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367 - An Artificial Larynx. Riesz (2), 1930
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367 - An Artificial Larynx. Riesz (3), 1930
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1641 - Marconiphone Type 80. Detalle de membrana de tela y bobina móvil (3), 1929
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1393 - La música electromagnética del profesor Theremin. Ibérica (2), 1928
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1398 - Theremin. Music from the ether. RCA Radio Victor (facsímil), 1929
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1392 - RCA Theremin. Instructions (facsímil) (1), 1929
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1392 - RCA Theremin. Instructions (facsímil) (3), 1929
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1392 - RCA Theremin. Instructions (facsímil) (4), 1929
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1392 - RCA Theremin. Instructions (facsímil) (5), 1929
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1642 - Philips 2109. Altavoz dinámico de bobina móvil (1), 1930
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1642 - Philips 2109. Altavoz dinámico de bobina móvil. Detalle de membrana (2), 1930
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