| Reference Number | TPC/5/7/12/1 |
| Title | General Arrangement of Patchboard for Lower Theatre - National Theatre |
| Level | Item |
| Date | 08 November 1973 |
| Description | Evershed Power-Optics Ltd drawing number V4318 issue A. Drawn by R King. |
| Extent | 1 drawing |
| Series | Evershed Power-Optics Ltd Drawings |