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).
Blueprint graph comparing the power curves of Marmon, Humber, Buick, Hup, and Dodge cars.
| Identifier | ExFiles\Box 180\M4\M4.2\ img022 | |
| Date | 25th February 1923 guessed | |
| Y-Axis Label: POWER, SE Y-Axis Values: 80, 70, 60, 50, 40 Line Labels: MARMON CAR. - M.E.F. HUMBER CAR. - M.E BUICK CAR.- M.E. HUP CAR. - M.E. DODGE CAR. - M | ||