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 regarding a Thermionic rectifying valve for H.T.
| Identifier | ExFiles\Box 60\2\ Scan065 | |
| Date | 1st January 1931 | |
| X.6094. 1.1.31. For previous matter relating to Thermionic rectifying valve for H.T. see X.3646. | ||