| Reference Number | TPC/3/23/21 |
| Title | National (Lower) Theatre Wagon Coupling Screw Details |
| Level | Item |
| Date | 09 May 1975 |
| Description | Hall Stage Equipment Ltd drawing number Y-75/39 issue A. Reference number L0901. Drawn by A J. Original date 8 November 1974. |
| Extent | 1 drawing |
| Series | The National Theatre Side Wagons in the Olivier and Lyttelton Theatres: Operating and Maintenance Instructions |