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[Subject: Water, Air, Space Transportation]
- A form of aircraft with unpowered freely rotating horizontal blades and a propeller
Translated by: ROBERT GRIGOR BAXTER
Translated in 3 languages
[Subject: Generalities]
Translated by: FARHAD PEZESHKI
Translated in 2 languages
- Rotorcraft with unpowered rotor(s) on a vertical axis
Translated in 17 languages