Reply to the post "The first successful flight in a helicopter in 1939: the invention of Igor Sikorsky"


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Reply to the post "The first successful flight in a helicopter in 1939: the invention of Igor Sikorsky"
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Reply to the post The first successful flight in a helicopter in 1939: the invention of Igor Sikorsky - Helicopter, Success, 1939, Inventions, Technics, Aviation, Youtube, Reply to post, Longpost, Falsification

1939 Youtube Aviation Helicopter Inventions Reply to post Technics Success Falsification
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