From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Blueprint showing three numbered abstract line diagrams.
| Identifier | ExFiles\Box 181\M13\M13.2\ img087 | |
| Date | 27th August 1931 guessed | |
| 1. 2. 3. | ||