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).
Comparative drawings of a B III and a Packard pivot pin at the bottom of the yoke.
| Identifier | ExFiles\Box 127\1\ scan0362 | |
| Date | 9th May 1938 guessed | |
| COMPARATIVE DRAWINGS OF B III AND PACKARD PIVOT PIN AT THE BOTTOM OF THE YOKE. B III PACKARD FIG. III | ||