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The workable Exchange (1 janv. 1878 – 31 déc. 1878)

Description:

The workable exchange was developed, which enabled calls to be switched between subscribers rather than having direct lines.

Ajouté au bande de temps:

click for descriptions/PHONE TIMLINE

23 oct. 2018

0

0

420

Date:

1 janv. 1878

31 déc. 1878

~ 12 months

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