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The Focke Helicopter (1938)

NASA Technical Reports Server (NTRS) · leaf 22

An illustration from The Focke Helicopter, 1938, leaf 22
Figs.9,10,11 H.A.O.A. Technical Memorandum No. 858

NASA Technical Reports Server (NTRS)

Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.

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