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A Modern Aladdin's Lamp 1940 Pub dawb Kev Nkag Mus Siv
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.
Sijhawm Sawv: 22 feeb
Zoo: HD
Tso Tawm: Oct 20, 1940
Ncig Teb Chaws: United States of America
Lus:
Cov ntsiab lus :
