| Reference Number | TPC/3/20/3 |
| Title | Emergency Ratchet Brake Arrangement National Theatre Masking Screen Hoist |
| Level | Item |
| Date | 27 June 1975 |
| Description | Tele-Stage Associates Ltd drawing number B58-8 issue 1. Drawn by R D Barnes. Original date 15 May 1975. |
| Extent | 1 drawing |
| Series | Masking Screen Hoists Operating and Maintenance Instructions |