Western Electric 1A2 key telephone system, with Seriss Corporation 1A2 KSU

Appropriate web links:
http://seriss.com/1a2-ksu/
http://seriss.com/people/erco/1a2/

A video clip of an initial Western Electric 1A2 KSU functioning:

A take a look at a very early essential telephone system, as well as the modern-day homebrew crucial solution device that drives this set.

Greg Ercolano’s YouTube network, where he’s uploaded a couple of video clips of the 1A2 KSU and also exactly how it has actually developed in time:
https://www.youtube.com/channel/UCxHid9oBBg5lJ4TL2fu0Y7g