Stating that Linotype valve rocker levers are now standard.
| Identifier | ExFiles\Box 38\1\ Scan005 | |
| Date | 20th March 1919 | |
| EFC. {E. Fowler Clarke - Electrical Engineer} from EH. EH20.3.19. X.3401.-LINOTYPE VALVE ROCKER LEVERS. The above levers are now standard. EFC. {E. Fowler Clarke - Electrical Engineer} | ||
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).