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14 set 1939 ano - First Helicopter

Descrição:

Igor Sikorsky successfully tests a helicopter in a tethered flight. In the USA.

Adicionado na linha do tempo:

Flight Timeline

ByWilliam Ferris

30 nov 2018

0

0

300

Data:

14 set 1939 ano

Agora

~ 86 years ago

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