Advertisement leaflet for an EKO spark plug with 3 electrodes.
| Identifier | ExFiles\Box 33\3\ Scan234 | |
| Date | 6th December 1922 guessed | |
| EKO PLUG 3 electrodes Best workmanship Improved construction Most durable Best nickel electrodes Absolutely gastight Easy to take to pieces Carbonisation impossible The EKO plug is supplied but in high grade nickel finish The EKO plug is sold with every turn desired Courte Elektroindustrie Berlin W. 15 Kaiserallee 222. | ||
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).