The Radio Robot. Ralph Stair of the Bureau of Standards has invented the Radio Robot, an electrical and mechanical trouble-shooter for radio receiving data. It is almost a human detective in finding radio troubles, testing and "pepping up" vacuum tubes, testing radio parts and complete receiving sets, both alternating-current and direct-current and is a portable power pack. 1929
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Image téléchargée par papyri le Dec 21, 2014
Droits d'auteur: Library of Congress image Call Number: LC-H2- B-3571 [P&P] No known restrictions. Photograph taken Aug. 24, 1929.