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Owned Ystradgynlais Colliery in the upper Swansea Valley in 1918-21, before the Gurnos Anthracite Collieries Company took it over.
| Mine | Region | Years |
|---|---|---|
| Ystradgynlais Colliery | Powys | 1918–1921 |
Record created: 11 October 2026 · Last researched: 11 October 2026
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