| Reference Number | TPC/5/7/1 |
| Title | External Cabling Diagram (Provisional) for the Drum Revolve |
| Level | File |
| Date | 19 June 1972-16 July 1973 |
| Description | Evershed Power-Optics Ltd engineering sketch A15630/X1 issues A and B. |
| Extent | 3 drawings |
| Series | Evershed Power-Optics Ltd Drawings |