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 of Champion sparking plugs for experimental purposes.
| Identifier | ExFiles\Box 35\3\ scan 175 | |
| Date | 15th September 1927 | |
| X.4196 To Roy{Sir Henry Royce}/Ms. from Hs.{Lord Ernest Hives - Chair} Hs{Lord Ernest Hives - Chair}/LG15.9.27. Please order for us from The Champion Sparking Plug Co., - for experimental purposes :- 4 doz. Champion sparking plugs type R.11. Hs.{Lord Ernest Hives - Chair} | ||