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Hubschrauber
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keywords:("Hubschrauber")
Report on design and performance of Focke helicopters developed in Germany
Report on design and performance of Focke helicopters developed in Germany
Report on design and performance of Focke helicopters developed in Germany
A series of flight effected with helicopter on the 15 28 and 29 of Jan 1921
Independent sustentation of an aeroplano in air
Elements of stability calculation for helicopter
Helicopters with mechanical propulsion
Nouvel Appareil a voilure tournante -- l'helicoptere Florine