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).
Photograph of the Champion Sparking Plug Company factory.
| Identifier | ExFiles\Box 162\3\ img101 | |
| Date | 9th September 1937 guessed | |
| CHAMPION CHAMPION Champion Sparking Plug World's largest sale | ||