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).
Sketch of an oil cooler and its connection to existing piping for an AZ series Phantom II model.
| Identifier | ExFiles\Box 131\4\ scan0142 | |
| Date | 7th April 1937 guessed | |
| Oil cooler, boss welded on to existing pipe, AZ series P II | ||