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Hubschrauber
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A series of flight effected with helicopter on the 15 28 and 29 of Jan 1921
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
New theories on problem of helicopter design
Die wahre Geschichte des Helikopters : von 1486 - 2005
Elements of stability calculation for helicopter
Nouvel Appareil a voilure tournante -- l'helicoptere Florine