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| Archive Reference / Library Class No. | NCB/C/PHO/1/68/14 |
| Former Reference | D4774/13/72/14 |
| Title | Photograph of the Hydra Muscle Wagon Control System installed near a loading chute at Williamthorpe Colliery's Coal Preparation Plant |
| Date | [mid 20th cent] |
| Description | Includes information on how the control system worked. Negative number: 4160. Copyright: National Coal Board. |
| Extent | 1 item |
| Level | Item |
| Repository | Derbyshire Record Office |
| Archive Creator | National Coal Board |
| Format | Photographic |