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).
Drawing showing top and side views of a hexagonal fastener.
| Identifier | ExFiles\Box 26\5\ Scan222 | |
| Date | 17th January 1929 | |
| JAN 1 7 1929 | ||