Reverse side of a technical document or blank gridded paper.
| Identifier | Morton\M22\ img076 | |
| Date | 5th May 1921 guessed | |
| ", | ||
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).