"June 10, 1918: A photograph taken at Rockwell Field in San Diego, California shows motor testing blocks being used in 1918 during World War I. The image, labeled as 19598, was received from the Commanding Officer of Rockwell Field."

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Size: 8459px × 5680px
Photo credit: © piemags/NSC / Alamy / Afripics
License: Licensed
Model Released: No

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