| Reference Number | TPC/3/20/2 |
| Title | Potentiometer Drive Gearbox National Theatre Masking Screen Hoist |
| Level | Item |
| Date | 27 June 1975 |
| Description | Tele-Stage Associates Ltd drawing number B58-4 issue 2. Drawn by R D Barnes. Original date 7 May 1975. |
| Extent | 1 drawing |
| Series | Masking Screen Hoists Operating and Maintenance Instructions |