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).
Photograph of two machined cylindrical metal parts, one with a smooth surface and the other with grooved patterns.
| Identifier | ExFiles\Box 95\2\ scan0031 | |
| Date | 27th February 1936 guessed | |
| BUMPER. 32 EX. | ||