Cover page for a document about the best hypoid lubricant.
| Identifier | ExFiles\Box 111\4\ scan0070 | |
| Date | 30th September 1938 guessed | |
| IS BEST HYPOID LUBRICANT ROYCAR. | ||
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).