"A Sperry Variable Pitch fan 'C' being installed on a radio apparatus for airplane use at the Radio Development Station in Washington, D.C. This photograph was taken by Corp. Klein on April 29, 1918. It is not intended for publication."

"A Sperry Variable Pitch fan 'C' being installed on a radio apparatus for airplane use at the Radio Development Station in Washington, D.C. This photograph was taken by Corp. Klein on April 29, 1918. It is not intended for publication."
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DETAILS
Image Number: 6145-51451237Royalty FreeCredit Line:PL Photography Limited/SuperStockCollection:PL Photography LimitedStory:Historical Scientific DocumentationModel Release:NoProperty Release:NoResolution:9177×6297
American military activities
United States Army|
World War One|