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 Masked Valve for a Nº2 Double Piston Damper.
| Identifier | ExFiles\Box 16\5\ Scan004 | |
| Date | 8th July 1944 | |
| MASK SEATED ON & GROUND .028 .350 DIA .707" DIA 90° HP VALVE LEAK .025 DIA F83361 TAB HOLES .065 DIA MASKED VALVE. Nº2 DOUBLE PISTON DAMPER. 8-7-44 | ||