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 concerning the Easier Change gearbox for the 20/25 HP model.
| Identifier | ExFiles\Box 30\1\ Scan191 | |
| Date | 18th June 1935 | |
| -2- Wor{Arthur Wormald - General Works Manager}8/R.18.6.35. 20/25 H.P. Page 5 - paragraph 2. Easier Change gearbox. Wor.{Arthur Wormald - General Works Manager} | ||