Image depicting an experimental model of an airplane radio telephone receiving set. The set, numbered 100, was issued to Radio Division for official use only. It had a wavelength range of 300-2400 meters and used a tickler coil. This photograph was taken on February 15, 1919, by a photographer from the 111-SC-36364 subect.

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Size: 8545px × 5778px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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