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 drawing with dimensions for a bent tool or key.
| Identifier | ExFiles\Box 91\1\ scan0326 | |
| Date | 15th June 1936 guessed | |
| C9-1 4" 3/8" 1/2" 1/4" x 1/4" | ||