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23 дек 1878 г. - Telephone exchange.

Описание:

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

Добавлено на ленту времени:

Line of time Hector de Jesús López Rosales

ByHector J Lopez
20 окт 2017
0
0
278

Дата:

23 дек 1878 г.
Сейчас
~ 145 г назад

Изображения:

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