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Owners of Blaenmawr Colliery near Tonmawr from 1921, and again in 1930 after a receivership.
| Mine | Region | Years |
|---|---|---|
| Garth Colliery, Tonmawr | Neath Port Talbot | 1921–1930 |
Record created: 2 October 2026 · Last researched: 2 October 2026
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