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).
Stating that production levers are not to be made in the Experimental Department.
| Identifier | ExFiles\Box 120\2\ scan0270 | |
| Date | 4th February 1938 | |
| Rm{William Robotham - Chief Engineer}/AFM.{Anthony F. Martindale} from Rm.{William Robotham - Chief Engineer} 1029 Rm{William Robotham - Chief Engineer}20/R.4.2.38. We do not agree to levers to be used on production being made in the Experimental Dept. Rm.{William Robotham - Chief Engineer} | ||