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).
Order for 50 special KR4A sparking plugs for long flights.
| Identifier | ExFiles\Box 79\1\ scan0160 | |
| Date | 16th January 1919 | |
| To Mr. Mills from EH. EH6/LG16.1.19. 16th. Jan. 1919. X.601 Will you please send an order to the Lodge Sparking Plug Co. Ltd., Rugby for 50 KR4A, plugs. These are special plugs which they are making for us for long flights. The price of these plugs is to be 10/- each. EH. | ||