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16 ore 24 min, 9 sett 1837 anni -

Descrizione:

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 ott 2018
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0
147

Data:

16 ore 24 min, 9 sett 1837 anni
Adesso
~ 186 years ago
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