| Reference Number | TPC/5/7/12/3 |
| Title | [Copy of Part General Arrangement of Patchboard for Lower Theatre - National Theatre] |
| Level | Item |
| Date | c 1974 |
| Description | A4 Photocopy of an Evershed Power-Optics Ltd drawing V4318. |
| Extent | 1 drawing |
| Series | Evershed Power-Optics Ltd Drawings |