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 card for the supply and fitting of Ribbon Valve Springs.
| Identifier | ExFiles\Box 80\3\ scan0126 | |
| Date | 21th June 1912 | |
| R.R. 148 (20 H) (X 829. 12.4.12) G 2506. X290 X494 G/535 Ribbon Valve Springs Instd. Supply 12 Spring washers E 2615. 21/6/12. (1 Card) Finished & fitted to cylinders in Grinding Dept according to Mr Elliotts Sheet No 2959. 6/7/12. | ||