Photograph displaying seven different models of Lodge spark plugs.
| Identifier | ExFiles\Box 58\2\ Scan047 | |
| Date | 4th July 1932 guessed | |
| [ "H14 LODGE 5", "R.298 LODGE", "HD {Mr Hayward / Mr Huddy} 14 LODGE 3", "LKS6", "LKS6", "LKS5", "LKS5" ], | ||
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).