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This electromechanical phone exchange was built by ATE of Liverpool (UK) in 1937. I've had it for a little over a year, and have taken it from non-working to fully working.
In this video, I'm running a BT Tester 355A Call Sender to repeatedly dial extension "35" to give the exchange a bit of a workout.
The call sender is shown at the end of the video, with the "monitor" sound turned up so you can hear dial tone, and ring tone.