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14 Sept 1939 Jahr - First Helicopter

Beschreibung:

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

Zugefügt zum Band der Zeit:

Flight Timeline

ByWilliam Ferris

30 Nov 2018

0

0

219

Datum:

14 Sept 1939 Jahr

Jetzt

~ 84 years ago

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