| Reference Number | TPC/5/7/62/2 |
| Title | Diagram of Patchboard Showing Numbers Lower Theatre - National |
| Level | Item |
| Date | 05 March 1974 |
| Description | Evershed Power-Optics Ltd drawing number X12617 issue C. Drawn by R King. Original date 7 February 1974. |
| Extent | 1 drawing |
| Series | Evershed Power-Optics Ltd Drawings |