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).
Blue page with the handwritten number 50.
| Identifier | ExFiles\Box 1\7\ B001_X15 20 46 50 59-page197 | |
| Date | 2nd April 1912 guessed | |
| 50 | ||