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).
Graph plotting various alphanumeric codes as vertical line segments between two diagonal lines.
| Identifier | ExFiles\Box 126\2\ scan0048 | |
| Date | 4th August 1936 guessed | |
| Y-axis: 120, 100, 80, 60, 40, 20 X-axis: 0, 20, 40, 60, 80, 100 Labels: P39567 SK 21822 PS 3372 PS 3371 PS 35762 SK 21823 SK 21682 | ||