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).
Blueprint showing a circular retaining ring with three integrated clamps.
| Identifier | ExFiles\Box 23\5\ Scan021 | |
| Date | 23th December 1927 guessed | |
| STUTZ 2 | ||