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).
Arranging the exchange of a U.4 rectifying valve.
| Identifier | ExFiles\Box 41\2\ Scan047 | |
| Date | 11th January 1927 | |
| X3646 To Wd.{Mr Wood/Mr Whitehead} from EFC, EFC2/T11.1.27. RE U.4 RECTIFYING VALVE. (EFC2/T 6.1.27) In regard to our letter/to The G.E.C. regarding the above, we have now received word that they will be pleased to exchange our present U.4 rectifying valve for another of the same type. We are therefore handing you this valve and shall be glad if you will kindly give instructions for its return to the G.E.C, Magnet House, Kingsway, London, W.C.2. EFC. | ||