Cpl. Steiniger, a photographer, captured this image on March 15, 1919, at the main telephone operating room in the Eastern Department of Aberdeen Proving Grounds. The photograph shows the Sumber telephone system in use. It was marked "For official use only" and assigned the number 41739.

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Size: 8525px × 5832px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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