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).
Photograph of a portable recording apparatus with a shoulder strap.
| Identifier | ExFiles\Box 138\2\ scan0066 | |
| Date | 19th January 1937 guessed | |
| OFF ON S INCHES CENTIMETRES | ||