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).
Light blue cover sheet with a handwritten number.
| Identifier | ExFiles\Box 1\8\ B001_X100 Engine Chassis-page001 | |
| Date | 11th August 1931 guessed | |
| 4027. | ||