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).
Photograph showing two metal washers or grommets.
| Identifier | ExFiles\Box 42\4\ Scan036 | |
| Date | 27th April 1927 | |
| 27. 4. 27 | ||