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).
Sending three miniature switches to be blackened for a lighting installation.
| Identifier | ExFiles\Box 38\3\ Scan240 | |
| Date | 24th March 1920 | |
| X.3362. To Mr. Hall. from EFC. EFC5/T24.3.20. X.3362 - LIGHTING INSTALLATION AT W.W. Herewith three miniature switches. Will you kindly have these blackened in the same manner as those previously sent to you. EFC. | ||