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 a helical gear layshaft cluster.
| Identifier | ExFiles\Box 136\2\ scan0126 | |
| Date | 3rd July 1939 guessed | |
| 670 | ||