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).
Grid of six numbered cells, each containing a hand-drawn cam profile diagram.
| Identifier | ExFiles\Box 152\1\ scan0085 | |
| Date | 4th January 1933 guessed | |
| 395 398 396 399 397 400 | ||