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1 gen 1840 anni - telegram poles

Descrizione:

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.

Aggiunto al nastro di tempo:

The timeline of communication

ByTom McDonell
24 ott 2019
0
0
237

Data:

1 gen 1840 anni
Adesso
~ 185 years ago
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