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).
Exploded view photograph of gearbox components, each numbered for identification.
| Identifier | ExFiles\Box 132\2\ scan0154 | |
| Date | 22th February 1939 guessed | |
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