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1 ene 1840 año - telegram poles

Descripción:

it was used to send messages through power lines, before mobile phones and internet. they were especially used for emergency calls because they were fact ways to receive messages.

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The timeline of communication

ByTom McDonell
24 oct 2019
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fecha:

1 ene 1840 año
Ahora mismo
~ 185 years ago
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