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51.3 MB (3.9 MB compressed)
4724 x 3798 pixels
39.9 x 32.3 cm ⏐ 15.7 x 12.7 in (300dpi)
LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY LIBRARY OF CONGRESS / SCIENCE PHOTO LIBRARY
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.
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