Igor, Russian-born aviation pioneer who invented the world's first mass-produced helicopter
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Related clues
- Igor ___, US aeronautical engineer who designed the first four-engined aeroplane (1913) and the first successful helicopter (1939)
- Igor -, Russian-American engineer who designed the first successful helicopter
- Igor ___, Kyiv-born aeronautical engineer who designed the US military's first helicopter in 1939
- Igor _, Russian-born US engineer who designed the first successful helicopter
- Inspired by stories by Jules Verne and sketches by Leonardo da Vinci, inventor of the first mass-produced helicopter
Possible answers
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- Y