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 an S.S. A.C.D. intermediate lever with an oil feed from an air vent.
| Identifier | ExFiles\Box 16\4\ Scan271 | |
| Date | 16th March 1931 | |
| H.S 333 16-3-31 140° .250 DIA TOP OF C'SINK DRILL '093 DIA S.S. A.C.D. INTERMEDIATE LEVER. F 82451/2. OIL FEED FROM AIR VENT. A.R | ||