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).
Cover note for the production inspection and test specification for a Duplex Button Switch.
| Identifier | ExFiles\Box 64\4\ scan0306 | |
| Date | 28th June 1929 | |
| X7655 Ey. from EFC. c. Sft.{Mr Swift} c. Sft{Mr Swift}/Mr Brock. EFC5/AD28.6.29. X.7655. DUPLEX BUTTON SWITCH. X.7781. Herewith please receive, Specification of Production Inspection and Test for the above. EFC. | ||