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The Penygarn, Pontypool company that took over the old Glyn levels in 1889, opened Glyntillery Colliery about 1913 and kept it until nationalisation.
| Mine | Region | Years |
|---|---|---|
| Glyntillery Colliery | Torfaen | 1889–1947 |
Record created: 4 October 2026 · Last researched: 4 October 2026
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