A close-up photograph of a relay rack taken at Scituate Proving Grounds, Massachusetts. The image shows the intricate wiring and equipment used for military communications during World War I. The photograph is labeled as 111-SC-43391 and was taken by an unknown photographer.

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Size: 8422px × 5734px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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