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16 ч 24 мин, 9 сент 1837 г. -

Описание:

David Alter of Pennsylvania develops the first American electrical telegraph, but he never develops the idea into a practical system.

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ByWilliam Ward
30 окт 2018
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16 ч 24 мин, 9 сент 1837 г.
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~ 186 г назад
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