A soldier operates an airplane radio telephone set on February 15, 1919. The set, known as SCR-91, was used for official military communications. It includes a control panel, radio buttons, an induction coil, transmitting and receiving keys, an interphone key, an amplification switch, and a base for receiving only.

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

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