Igor ___, Kyiv-born aeronautical engineer who designed the US military's first helicopter in 1939
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Related clues
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- Inspired by stories by Jules Verne and sketches by Leonardo da Vinci, inventor of the first mass-produced helicopter
- Igor, Russian-born aviation pioneer who invented the world's first mass-produced helicopter
Possible answers
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- I
- K
- O
- R
- S
- K
- Y