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1 jan 1840 ano - telegram poles

Descrição:

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.

Adicionado na linha do tempo:

The timeline of communication

ByTom McDonell
24 out 2019
0
0
229

Data:

1 jan 1840 ano
Agora
~ 185 years ago
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