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A subsidiary of a London oil-products firm; purchased Gartheiniog quarry in 1935 and worked it until its final closure in October 1937.
| Mine | Region | Years |
|---|---|---|
| Gartheiniog Quarry | Gwynedd | 1935–1937 |
Record created: 30 August 2026 · Last researched: 30 August 2026
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