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| Archive Reference / Library Class No. | NCB/B/MED/2/4 |
| Former Reference | D5659/2/4 |
| Title | File of correspondence between the NCB Insurance Department and Drs HA Mason and J Mason on cases concerning injured coal mine workers |
| Date | Aug 1948-May 1966 |
| Description | Primarily referring to injuries sustained during the 1920s-1940s |
| Extent | 1 file |
| Level | File |
| Repository | Derbyshire Record Office |
| Archive Creator | National Coal Board |
| Access Category | CLOSED |
| Closed Until | 01/01/2051 |
| Access Conditions | Closed for 86 years from the date of the last record. See ‘Data subjects in archives privacy notice’ (link below) for further information. |
| Privacy Notice | Data Subjects in Archives Privacy Notice |