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The company that opened Nantewlaeth Colliery, near Cymmer in the Afan valley, at the beginning of the twentieth century.
| Mine | Region | Years |
|---|---|---|
| Nantewlaeth Colliery | Neath Port Talbot | ?–? |
Record created: 4 October 2026 · Last researched: 4 October 2026
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