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).
Cross-section diagram of a patented 'CF' spark plug.
| Identifier | ExFiles\Box 58\2\ Scan081 | |
| Date | 12th November 1931 | |
| SCHEMA CANDELA .CF BREVETTATA - FIMAC - FABBRICA ITALIANA MACCHINE ARIA COMPRESSA MILANO - VIA PETITTI N'18 Milano 12.11.931 | ||