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 component.
| Identifier | ExFiles\Box 125\1\ scan0223 | |
| Date | 26th February 1936 guessed | |
| 2205C. 2205C | ||