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The company that held the Cwmavon works estate and its Oakwood slants at Pontrhydyfen in the 1880s.
| Mine | Region | Years |
|---|---|---|
| Oakwood Colliery (Pontrhydyfen) | Neath Port Talbot | ?–? |
Record created: 21 October 2026 · Last researched: 21 October 2026
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