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).
Photograph showing a close-up view of an engine cylinder head.
| Identifier | ExFiles\Box 179\2\ img103 | |
| Date | 31th December 1931 guessed | |
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