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).
Comparison photograph of a dirty and a clean Phantom III hydraulic tappet filter.
| Identifier | ExFiles\Box 96\2\ scan0276 | |
| Date | 6th December 1937 guessed | |
| PHANTOM III HYDRAULIC TAPPET FILTER. | ||