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).
Blueprint of a new type of valve with two scale drawings.
| Identifier | ExFiles\Box 151\2\ scan0098 | |
| Date | 4th October 1933 | |
| Hs {Lord Ernest Hives - Chair} 1154, SCALE 1/1, SCALE 2/1, .005" CLEARANCE, .171" DIA, .050" RAD, NEW TYPE VALVE, ROLLS-ROYCE, LTD, PRINT ROOM, 4 OCT 1933, DERBY., h.e.g, 3.10.33 | ||