| Reference Number | TPC/3/11/4 |
| Title | Carriage Drum & Ratchet Mech. Detail |
| Level | Item |
| Date | 08 June 1976 |
| Description | Mole-Richardson (Stage & Studio Engineering) Ltd drawing number D18-533 issue A. Works number 4989. Drawn by M C. Original date 24 May 1976. |
| Extent | 1 drawing |
| Series | National Theatre Technical Manual for Cottesloe Sound/Fire Door |