Phantom Ciruits (1 ene 1921 año – 31 dic 1921 año)

Descripción:

The switching of large numbers of calls was made possible through the use of phantom circuits. This allowed three conversations to take place on two pairs of wires.

Añadido al timeline:

23 oct 2018

0

0

313

click for descriptions/PHONE TIMLINE

Jasun Foley
1st period
10/23/2018

fecha: