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).
Breakdown of steering columns ordered by type, quantity, and percentage.
| Identifier | ExFiles\Box 80\1\ scan0079 | |
| Date | 3rd October 1916 guessed | |
| - 2 - steering columns were ordered as follows:- "A" column ... 47 = about 15% "B" " ... 63 = " 20% "C" " ... 96 = " 30.5% "D" " ... 108 = " 34.4% | ||