US Army personnel operating wired wireless transmitting and receiving apparatus during World War I. The apparatus, marked with the symbol A, was used for official communication purposes and was designated as "FOR OFFICIAL USE ONLY." This photograph is part of the collection from the Signal Corps, taken on September 23, 1920.

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Size: 8430px × 5731px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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