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).
The creation of a separate file for letters concerning Aspin Cylinder Heads.
| Identifier | ExFiles\Box 134\1\ scan0187 | |
| Date | 13th March 1944 guessed | |
| Letters re. Aspin Cylinder Heads taken out and made into separate file numbered 1129A. | ||