Caldwell Controllable-Pitch Propeller Patent Print
Patent No. US1893612 · 1933
Invented by Frank W. Caldwell
Vintage 1933 patent drawing of the caldwell controllable-pitch propeller by Frank W. Caldwell. Museum-quality archival giclée print.
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About This Print
Vintage 1933 patent drawing of the caldwell controllable-pitch propeller by Frank W. Caldwell. Museum-quality archival giclée print.
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