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9 июл 1920 г. - Quartz clock invented in America

Описание:

Used vibrations and the electric properties of quartz to keep time.

Добавлено на ленту времени:

clocks

14 сен 2017

0

0

716

Дата:

9 июл 1920 г.

Сейчас

~ 105 г назад

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