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| Identifier | ExFiles\Box 152\1\ scan0087 | |
| Date | 11th January 1933 guessed | |
| 407 410 408 409 | ||
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).