LydiaAlvarez LydiaAlvarez

22-03-2021
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Who was the Russian 12 year old boy who later designed and built a helicopter based on Da Vinci's notebook?

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chetankachana chetankachana

22-03-2021

Answer:

igor sikorsky

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misheenah misheenah

22-03-2021

Answer:

Igor Sirkorsky

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