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).
Comparison list of various 12 volt and 6 volt chassis starter motors and their reference numbers.
| Identifier | ExFiles\Box 61b\3\ scan0084 | |
| Date | 28th September 1920 | |
| sl6027. 28.9.20. X.543 - CHASSIS STARTER MOTORS (All 12 volt except Bijur A.21 6 volt). For comparison of design and performance. C.A.V. Z.C. X.3247. Lucas A.510. X.3161. Bijur A.21. X.1058. Bosch. S.45. X.1248. R.R.17. X.2642. R.R.24 X.2642. R.R.45a. X.2642. R.R.45b. X.3082. R.R. Goshawk. X.3534.X.4384. Bijur 1 AD. X.1058. U.S.A. Bosch. X.4007. Westinghouse. X.1086. EFC. | ||