| Reference Number | TPC/3/6/20 |
| Title | Hydraulic Schematic Load Platforms - Disc/Drum Clamps and Location Locks |
| Level | Item |
| Date | 28 April 1978 |
| Description | Mole-Richardson (Stage & Studio Engineering) Ltd drawing number D14/210B. Drawn by S W. Works number 2815/101/. Original date 7 February 1974. |
| Extent | 1 drawing |
| Series | National Theatre Drum Drawings Part 2: 1 of 2 |