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 of a proposed new washer for the 40/50 valve spring.
| Identifier | ExFiles\Box 171\3\ img157 | |
| Date | 2nd March 1923 guessed | |
| E.22630 PROPOSED NEW WASHER. 40/50 VALVE SPRING EXIST | ||