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The Focke Helicopter *
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- Journal:
- The Aeronautical Journal / Volume 42 / Issue 331 / July 1938
- Published online by Cambridge University Press:
- 28 July 2016, pp. 577-590
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Fifth Cierva Memorial Lecture: German Thinking on Rotary-wing Development
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- Journal:
- The Aeronautical Journal / Volume 69 / Issue 653 / May 1965
- Published online by Cambridge University Press:
- 04 July 2016, pp. 293-305
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