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Scientific American

September 1, 1940

1 min read

Helicopters

Rotating-Wing Aircraft Exhibit Desirable Characteristics for National Defense

By Alexander Klemin

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This article was originally published with the title “Helicopters” in Scientific American Magazine Vol. 163 No. 3 (September 1940), p. 138
doi:10.1038/scientificamerican0940-138

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