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13 май 1940 г. - First untethered Helicoptered flight

Описание:

Igor Sikorsky successfully tests an untethered helicopter

Добавлено на ленту времени:

Flight Timeline

ByWilliam Ferris
30 ноя 2018
0
0
219

Дата:

13 май 1940 г.
Сейчас
~ 84 г назад
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