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).
Cross-sectional diagram of a valve assembly with instructional notes.
| Identifier | ExFiles\Box 67\3\ scan0050 | |
| Date | 28th November 1928 | |
| ROLLS-ROYCE. LIMITED PRINT ROOM 4 DEC 1928 DERBY ARROWS MUST BE IN LINE G75363 28/11/28 | ||