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 showing a cross-section of a valve seating component.
| Identifier | ExFiles\Box 13\3\ 03-page280 | |
| Date | 20th December 1972 | |
| V1004 VALVE SEATING 4° .138 DIA. FOR OTHER DIMENSIONS SEE (ER1552) Y.W.A 20.12.72 | ||