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Owners of Wham Colliery near Butterknowle, County Durham, from the 1910s; J. W. Firbank managed it in the 1920s.
| Mine | Region | Years |
|---|---|---|
| Wham Colliery | County Durham | ?–1931 |
Record created: 22 October 2026 · Last researched: 22 October 2026
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