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).
Patent specification cover page for an Auto-Switch.
| Identifier | ExFiles\Box 59\1\ Scan350 | |
| Date | 28th June 1929 | |
| X4008. 28.6.29. AUTO-SWITCH PATENT SPECIFICATION NUMBER 312099 | ||