A photograph taken on May 2, 1918, shows a radio apparatus designed for airplane use. The image displays a Fan "A" Pressure Plate and was taken at the Radio Development Station in Washington, The photograph bears the reference number 111-SC-9111 and was not intended for publication.

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Size: 9177px × 6297px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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