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).
Communication regarding the secure storage of detail drawings for two guns in a bank vault.
| Identifier | ExFiles\Box 170\4\ img073 | |
| Date | 4th November 1940 guessed | |
| If you would, therefore, send over complete detail drawings of both guns, we will get them in our bank vault, under lock and key, where no-one can get at them except McManus or myself......................" OY. | ||