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).
Cover sheet for a 40/50 instrument with a small type dial.
| Identifier | ExFiles\Box 50\4\ Scan233 | |
| Date | 6th March 1928 guessed | |
| 4308 B 40/50 Instrument with Small type dial | ||