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).
List of components and associated part numbers for the 4.EAC.II unit.
| Identifier | ExFiles\Box 72\2\ scan0137 | |
| Date | 17th July 1925 guessed | |
| 4.EAC.II - UNIT Actuating Box to L.O.P. D.70353. Main Switch to L.O.P. D.1429. Coil. P.R.2. Redmanol Case Coil fitted. RHC.{R. H. Coverley - Production Engineer} | ||