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).
On a cover sheet indicating the location of previous correspondence.
| Identifier | ExFiles\Box 12\6\ 06-page001 | |
| Date | 22th January 1931 guessed | |
| Previous Corresp. in Strong Room | ||