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Early 20th Century military amplifiers

Early 20th Century military amplifiers

C009/3091

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Credit

LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY

Caption

Early 20th Century military amplifiers. Historical image of large amplifiers being used to listen for approaching enemy aircraft. Photographed at the US Air Force base in Bolling Field, Washington DC, USA. Published in 1921.

Release details

Model release not required. Property release not required.

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