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The workable Exchange (1 ene 1878 año – 31 dic 1878 año)

Descripción:

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

Añadido al timeline:

click for descriptions/PHONE TIMLINE

23 oct 2018

0

0

420

fecha:

1 ene 1878 año

31 dic 1878 año

~ 12 months

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