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).
The base of a flange where the nickel-plate is cut away.
| Identifier | ExFiles\Box 127\3\ scan0130 | |
| Date | 1st October 1935 guessed | |
| M1193. A1493-7 A1500 Base of flange where Ni-pl. cut away in radius. | ||