Blueprint of shutter operating toggles.
| Identifier | ExFiles\Box 15\1\ Scan354 | |
| Date | 8th September 1930 guessed | |
| SHUTTER OPERATING TOGGLES AS SHEWN ON E77676 A B C | ||
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).