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 modify the part numbers for existing tubes and valves.
| Identifier | ExFiles\Box 87\3\ scan0144 | |
| Date | 16th May 1935 | |
| To RHC.{R. H. Coverley - Production Engineer} x242 Hs{Lord Ernest Hives - Chair}/Les.10/KW.16.5.35. Will you please modify :- 2. Existing Tubes Ex.17558 to Hs.{Lord Ernest Hives - Chair}1972. 2. Existing Valves Ex.17556 to Hs.{Lord Ernest Hives - Chair}1973. Hs{Lord Ernest Hives - Chair}/Les.{Ivan A. Leslie} | ||