| Reference Number | TPC/5/7/12/2 |
| Title | General Arrangement of Patchboard for Lower Theatre - National Theatre |
| Level | File |
| Date | 13 July 197[4] |
| Description | Evershed Power-Optics Ltd drawing number V4318 issue B. Two copies, one annotated. Drawn by R King. Original date 8 November 1973. |
| Extent | 2 drawings |
| Series | Evershed Power-Optics Ltd Drawings |