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).
Record concerning a valve spring and the supply of spring washers.
| Identifier | ExFiles\Box 80\3\ scan0118 | |
| Date | 18th March 1912 | |
| R.R. 149 (20 H) (X 594. 6.2 12) G 2370 Q/535. Valve Spring E 2360 X290 (1 Card) Inskd Supply Hit 18/3/12 13 Pairs Spring Washers E 2475/b. (1 Card) * Finished fettled on crankcase in Grinding Dept. 3/4/12. | ||