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 of a mechanical valve and pipe assembly.
| Identifier | ExFiles\Box 179b\4\ img050 | |
| Date | 13th April 1933 guessed | |
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