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).
Factory costs for a Wraith cylinder liner.
| Identifier | ExFiles\Box 8\6\ 06-page54 | |
| Date | 9th June 1939 | |
| 619 RM{William Robotham - Chief Engineer}/CTS.{C. Trot Salt - Carburation} G/Rb.{R. Bowen} 9/A/73/R.{Sir Henry Royce} 9.6.39 Wraith Cylinder liner EW 2149/80 Factory Costs. File 1260 | ||