Diagram illustrating the guides for top and bottom shoes.
| Identifier | ExFiles\Box 11\2\ 02-page248 | |
| Date | 10th May 1929 guessed | |
| GUIDES FOR TOP SHOES GUIDES FOR BOTTOM SHOES FHH | ||
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).