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).
Title page for a document about a switchbox.
| Identifier | ExFiles\Box 47\4\ Scan239 | |
| Date | 30th August 1923 guessed | |
| SWITCHBOX | ||