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23 dic 1878 anni - Telephone exchange.

Descrizione:

1878 The first telephone exchange is set up in New Haven, USA. It consisted of a manual controller board of 21 subscribers.

Aggiunto al nastro di tempo:

Line of time Hector de Jesús López Rosales

ByHector J Lopez

20 ott 2017

0

0

401

Data:

23 dic 1878 anni

Adesso

~ 146 years ago

Immagini:

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