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).
Reference note for previous documents concerning production tests of 40/50 electrical components.
| Identifier | ExFiles\Box 60\2\ Scan023 | |
| Date | 1st January 1931 | |
| X.6088. 1.1.31. For previous matter relating to Production tests of 40/50 electrical components see X.7781. | ||