Original National Coal Board negative number: D1/433. Original Glamorgan Archives Box number: DNCB/48/1.
Divisional Lamp Testing Station, Treorchy, Apparatus for testing the cementing between the glass envelope and metal cap of the bulb
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- ReferenceGB 214 DNCB/14/4/140/159
- Dates of Creation11 May 1964
- Physical Description1 Glass Plate Negative