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23 déc. 1878 - Telephone exchange.

Description:

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

Ajouté au bande de temps:

Line of time Hector de Jesús López Rosales

ByHector J Lopez

20 oct. 2017

0

0

405

Date:

23 déc. 1878

Maintenaint

~ Il y a 146 ans

Les images:

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