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).
Drawing of a better arrangement for the throttle connecting spring.
| Identifier | ExFiles\Box 11\2\ 02-page090 | |
| Date | 5th February 1929 guessed | |
| better arrangement for throttle connecting Hiffy 89 | ||