Radio Field Instruments used by the Signal Corps, Combined transmitting and receiving unit (type #13) for use with #67 Radio Telephone Set. The image shows the case open. Taken on April 11, 1918, by photographer deBerri. Not for publication. Reference number: 111-SC-7464. 50 words.

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Size: 9183px × 6305px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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