| Reference Number | TPC/5/7/37 |
| Title | Suggested Alterations to Drum Revolve Control Position. National Theatre |
| Level | File |
| Date | 14 December 1973-16 January 1974 |
| Description | Evershed Power-Optics Ltd drawing number W6827 issues B and C. |
| Extent | 2 drawings |
| Series | Evershed Power-Optics Ltd Drawings |