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).
Request to alter a duplex push button switch according to a revised table of gaps for production.
| Identifier | ExFiles\Box 64\4\ scan0307 | |
| Date | 28th June 1929 | |
| X7655. Experimental Shop. from EFC. EFC5/AD28.6.29 X. 765G. DUPLEX PUSH BUTTON SWITCH. Will you please have the Duplex push button switch altered to be in accordance with the revised table of gaps attached which are now agreed upon finally as those suitable for production. EFC. | ||