| Reference Number | TPC/5/6/114 |
| Title | National Theatre Sound/Fire Door Operating Unit (Opening and Automatic Closing) |
| Level | Item |
| Date | February 1974 |
| Description | Mole-Richardson (Stage & Studio Engineering) Ltd drawing number D14 228. Drawn by G R. Works number 2832 and 3230. |
| Extent | 1 drawing |
| Series | Mole-Richardson (Stage & Studio Engineering) Ltd Drawings |