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 regarding an insulated switch fitted to the steering column of chassis 1920.
| Identifier | ExFiles\Box 31\2\ Scan014 | |
| Date | 11th March 1915 | |
| 28181. MAR 11 '15 Fitted to chassis 1920 (10-3-15). Insulated switch fitted to steering column. (end) H.C. Matthews DC1410. | ||