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dec 23, 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.

Added to timeline:

Line of time Hector de Jesús López Rosales

ByHector J Lopez

20 Oct 2017

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399

Date:

dec 23, 1878

Now

~ 146 years ago

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