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The company that owned Merthyr Llantwit Colliery near Tonmawr by 1908 and into the 1920s, working the Wenallt seam.
| Mine | Region | Years |
|---|---|---|
| Merthyr Llantwit Colliery | Neath Port Talbot | 1908–1926 |
Record created: 2 October 2026 · Last researched: 2 October 2026
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