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 diagrams illustrating a mechanical assembly in three figures.
| Identifier | ExFiles\Box 147\1\ scan0169 | |
| Date | 1st April 1937 guessed | |
| N. 338761 (1° completivo del brevetto n. 336627) Fig 1 Fig 2 Fig 3 | ||