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 showing a cross-section and side view of an engine piston.
| Identifier | ExFiles\Box 170\1\ img057 | |
| Date | 18th January 1939 guessed | |
| MACHINE WHERE MARKED F GENERAL DRAW ON ST A F | ||