Washington D.C. "Paragon adjustable and reversible aircraft propeller created by Spencer Heath and tested on October 11, 1922, at Bolling Field."
[Photo: Shorpy/Harris & Ewing]
The reversible aircraft propeller
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Washington D.C. "Paragon adjustable and reversible aircraft propeller created by Spencer Heath and tested on October 11, 1922, at Bolling Field."
[Photo: Shorpy/Harris & Ewing]
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