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).
Table of specified gaps for a new duplex pushbutton switch.
| Identifier | ExFiles\Box 64\3\ scan0276 | |
| Date | 30th June 1926 | |
| To BY/RD. from EFC. X7650 ps EFC3/T30.6.26. X.7650. DUPLEX PRESSBUTTON.SWITCH. Herewith we hand to you copy of table of specified gaps in connection with the new duplex push button switch. Would you kindly arrange your instructions to the Expl. Shop accordingly. EFC. | ||