A photograph taken by Sgt. Gray depicting a long wave radio receiving set. The receiving set has a range of 6000 to 18000 meters and this image shows the interior view. The photograph was taken on March 15, 1919, and is marked "Issued for official use only. Not for publication."

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Size: 8525px × 5802px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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