| Reference Number | TPC/5/7/11 |
| Title | Assembly Drawing of Hardware for Patchboard - Lower Theatre - Nat Theatre |
| Level | Item |
| Date | 05 November 1973 |
| Description | Evershed Power-Optics Ltd drawing number V4314 sheet 2 of 3. Drawn by R King. |
| Extent | 1 drawing |
| Series | Evershed Power-Optics Ltd Drawings |