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).
Patent specification drawings for an internal combustion engine cylinder head and valve mechanism.
| Identifier | ExFiles\Box 147\4\ scan0150 | |
| Date | 16th May 1939 guessed | |
| 525,879 COMPLETE SPECIFICATION, 1 SHEET, [This Drawing is a reproduction of the Original on a reduced scale.], FIG. 1, FIG. 2., A, B, B1, C, E, E1, E2, E3, F, Y, Malby & Sons, Photo - Lith. | ||