Monocopter (German Wikipedia)

Analysis of information sources in references of the Wikipedia article "Monocopter" in German language version.

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espacenet.com

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  • Patent US1133660A: Helicopter. Angemeldet am 29. April 1912, veröffentlicht am 30. März 1915, Erfinder: Alphonse Papin, Didier Rouilly.

gloubik.info

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