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).
Typed list of component part numbers and their descriptions.
| Identifier | ExFiles\Box 142\4\ scan0093 | |
| Date | 4th April 1938 | |
| -2- Rm{William Robotham - Chief Engineer}1/R.4.4.38. GW740 - Housing - Main Spring. GW1944 - Clutch Casing. GW1666 - Bracket. GW1665 - Bracket. GW1650 - Retaining Cover. GW1860 - Brake Shoe. GW1861 - " " Rm.{William Robotham - Chief Engineer} | ||