G.P.O. Master Clock System by Scaleyback - Dailymotion

Name: GPO master clock system on advance
Uploaded: 2015-12-20T10:27:51+00:00
Duration: 56 s
Channel: Scaleyback
Description: Advancing the GPO master clock system after a service and upgrade <br /> <br />More information on all G.P.O. clocks can be found at:http://gpoclocksystems.byethost22.com

Scaleyback

This is the Hipp toggle master clock system that was used by the British G.P.O. to time their telephone exchanges.

GPO master clock system on advance

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G.P.O. Master Clock System

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