Image: 1933 Frank W. Caldwell (cropped)
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Description: Frank W. Caldwell is congratulated by President Franklin D. Roosevelt on the award of the Collier Trophy (visible in the background) in 1933 for his work with Hamilton Standard on the controllable-pitch propeller. NASM-NAM-A-48118
Title: 1933 Frank W. Caldwell (cropped)
Credit: https://airandspace.si.edu/collection-objects/caldwell-frank-w-roosevelt-franklin-delano-president-awards-and-trophies-collier
Author: Unknown authorUnknown author
Usage Terms: Public domain
License: Public domain
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