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).
File note regarding the 25/30 HP Chassis gearbox, with a cross-reference to another file.
| Identifier | ExFiles\Box 7\3\ X 602 Axle Rear-page59 | |
| Date | 6th December 1938 | |
| 602. Gry.{Shadwell Grylls} By/Cul. 7/B.6.12.38 25/30 H.P. Chassis Gearbox see file 628. | ||