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The firm that took over the Ynyspenllwch take at Clydach in 1887 and sank the Gueret's Graigola pit in 1889; L. Gueret worked it in 1893.
| Mine | Region | Years |
|---|---|---|
| Guerets Colliery | Swansea | 1887–1904 |
Record created: 10 October 2026 · Last researched: 10 October 2026
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