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 of a mechanical assembly with an annotation for a modification.
| Identifier | ExFiles\Box 13\7\ 07-page023 | |
| Date | 29th November 1928 guessed | |
| G76591 LIP THREE TIMES THE PRESENT DEPTH | ||