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Hubschrauber
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The actual state of the helicopter problem
Will captive helicopters replace the observation balloon?
Air travel with special reference to the helicopter
Nouvel Appareil a voilure tournante -- l'helicoptere Florine
Project SQUID. Application of the Ram Rocket as a Helicopter Propulsion System
Reflections on interrelation of helicopter and heliport design
Integrated Instrument Development Program and Ideal Man-Helicopter Engineering Project
Letter Report of Evaluation of the Curtiss-Wright All-Mechanical Speed Control
Controllability of Pentana-Type Companies in Mobile Operations. Volume II: Logistics