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Fans with overlapping blades were invented (30 сент 1920 г. – 30 сент 1930 г.)

Добавлено на ленту времени:

Heat Control Devices of the Past

ByEric Wang
24 ноя 2017

Дата:

30 сент 1920 г.
30 сент 1930 г.
~ 10 years
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