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).
Note instructing that only 6 sets of the Gearbox Section are to be built.
| Identifier | ExFiles\Box 161a\3\ scan0165 | |
| Date | 9th May 1939 guessed | |
| -2- SUBJECT. REMARKS. Gearbox Section. Note :- 6 Sets only instructed to be built. | ||