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23 Dez 1878 Jahr - Telephone exchange.

Beschreibung:

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

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Line of time Hector de Jesús López Rosales

ByHector J Lopez

20 Okt 2017

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403

Datum:

23 Dez 1878 Jahr

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~ 146 years ago

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