| Reference Number | TPC/5/7/9 |
| Title | Drum Revolve Control Panel National Upper Theatre |
| Level | File |
| Date | 20 September 1973-23 November 1973 |
| Description | Evershed Power-Optics Ltd drawing number V4267, unnumbered issue and issue D. |
| Extent | 2 drawings |
| Series | Evershed Power-Optics Ltd Drawings |