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23 dic 1878 año - Telephone exchange.
Descripción:
1878 The first telephone exchange is set up in New Haven, USA. It consisted of a manual controller board of 21 subscribers.
Añadido al timeline:
Line of time Hector de Jesús López Rosales
By
Hector J Lopez
20 oct 2017
0
0
278
fecha:
23 dic 1878 año
Ahora mismo
~ 145 years ago
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