A Modern Aladdin's Lamp
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Sinopse
With Western Electric Vacuum Tubes in the starring roles, this film tells the fascinating story of tube development from the first crude bulbs of Edison and De Forest to the powerful and efficient tubes in use today, and shows the prominent part they play in radio, long-distance telephony, public address systems, sound motion pictures and the phonograph.
Ficha técnica
- 20 de outubro de 1940
- Released
- United States of America
- Audio Productions Inc.
- 22min
Onde assistir
Nenhuma opção de streaming conhecida (país: Brasil).
