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).
Noting experimental numbers for American Model Chassis components.
| Identifier | ExFiles\Box 137\5\ scan0017 | |
| Date | 19th November 1919 | |
| X.3720 DA{Bernard Day - Chassis Design}/STT. EFC/AT1/S19.11.19. X.3614. - RE AMERICAN MODEL CHASSIS. Will you kindly note the following experimental numbers have been taken out for the above chassis. X.3685. Speedometer- drive. X.3720. 3/19 Gear Box with Central Control. AT. | ||