"Telephone circuit diagram for the Office of the Chief Signal Officer of the AEF, 5th Army Corps, France. The diagram was taken by the Signal Corps and received on 2-19-1921. It showcases the circuit layout and various locations such as Chéppy and Recourt for testing and communication purposes."

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Size: 8530px × 5771px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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