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

Appropriate web links:

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: