RESEARCH LABORATORY
ORIGINAL SITE OF THE LABORATORY AND FACTORY OF FED-
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ELWELL. HERE, WITH TWO ASSISTANTS, DR. LEE DE FOREST, IN-
VENTOR OF THE THREE-ELEMENT RADIO VACUUM TUBE,
DEVISED IN 1911-13 THE FIRST VACUUM TUBE AMPLIFIER
AND OSCILLATOR. WORLD-WIDE DEVELOPMENTS BAS-
ED ON THIS RESEARCH LED TO MODERN RADIO COM-
MUNICATION, TELEVISION AND THE ELECTRONICS AGE.
CALIFORNIA REGISTERED
HISTORICAL LANDMARK NO. 836