Category:Frank W. Caldwell

Media in category "Frank W. Caldwell"

The following 3 files are in this category, out of 3 total.

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  1,000th Controllable Pitch Propeller produced by Hamilton NASM-NAM-A-3738.jpg 1,573 × 1,200; 190 KB
  
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  1933 Collier Trophy President Roosevelt congratulates Frank W. Caldwell.jpg 1,539 × 1,177; 191 KB
  
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  1933 Frank W. Caldwell (cropped).jpg 567 × 803; 52 KB