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A Modern Aladdin's Lamp 1940 Aksè gratis san limit
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.
Runtime: 22 minit
Kalite: HD
Lage: Oct 20, 1940
Peyi: United States of America
Lang:
Mo kle :
