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).
Request to obtain up-to-date catalogues for thermionic valves from three specified companies.
| Identifier | ExFiles\Box 41\2\ Scan011 | |
| Date | 21th November 1922 | |
| X3646 To Wd{Mr Wood/Mr Whitehead}/Ms. from EFC. c. Hy.{Tom Haldenby - Plant Engineer} EFC4/T21.11.22. X.3646 - RE THERMIONIC VALVES Would you kindly obtain up-to-date catalogues of Thermionic Valves, particularly those for rectifying, from (1) The Edison Swan Elec. Co. Ponders End, Middlesex. (2) The Marconi Osram Co. Hammersmith, W. (3) The B.T.H. Company. EFC. | ||