Sikorsky R-4B of the 2nd Aircraft Repair Unit (Floating)
Первый серийно выпускавшийся в США вертолёт: ’Sikorsky R-4 Hoverfly’.
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DEVELOPMENTS IN INSECTICIDE & FUNGICIDE 1940s CORNELL UNIVERSITY DEPT. OF ENTOMOLOGY FILM XD42504
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Sikorsky R-4B, Luzon, 1945
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Sikorsky R-4B of the 2nd Aircraft Repair Unit (Floating)
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