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General Radio type 726-A vacuum tube voltmeter
CC0 · no rights reserved

General Radio type 726-A vacuum tube voltmeter

General Radio Company · overall: 8 in x 9 in x 14 in; 20.32 cm x 22.86 cm x 35.56 cm

From the collection of National Museum of American History. Free to download, adapt and use — no permission needed.

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National Museum of American History’s own description
Subjects
VoltmeterMeasuring DevicesWork and Industry: Electricity
Credit lineGeneral Radio type 726-A vacuum tube voltmeter. General Radio Company. National Museum of American History, from Princeton University, Department of Physics, thru Frank Shoemaker. CC0.
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