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).
Note about two provisional patents, one for a four-wheel jack and another expiring in October.
| Identifier | ExFiles\Box 26\3\ Scan240 | |
| Date | 9th August 1933 guessed | |
| gen. We have taken out a Provisional Patent which expires in October. Yrs. faithfully, C. R.{Sir Henry Royce} Acton. P.S. We have also a Provisional Patent for the four wheel jack separately. | ||