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).
Diagram illustrating the external and internal cross-section of a cylindrical filter, showing flow direction.
| Identifier | ExFiles\Box 152\3\ scan0210 | |
| Date | 19th June 1936 guessed | |
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