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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

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308

Дата:

13 май 1940 г.

Сейчас

~ 85 г назад

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