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 detailing a modification to an air silencer component.
| Identifier | ExFiles\Box 152\3\ scan0245 | |
| Date | 29th March 1938 guessed | |
| STEEL ALUM MOD. TO AIR SILENCERS. | ||