pdf A128.820 Toll Switchboard No. 3C or 3CL, Issue 1, April 1950 - Checking List Popular

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A128.820 Toll Switchboard No. 3C or 3CL, Issue 1, April 1950 - Checking List

Checking List, BSP MP Items covering sequence charts, operational sketches and associated reference material. (Central Office Maintenance)

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