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).
Instruction card for the supply of Ribbon Valve Springs and associated parts.
| Identifier | ExFiles\Box 80\3\ scan0127 | |
| Date | 21th June 1912 | |
| R.R. 148 (20 H) (X 828. 12.4.12) G 2506. X290 X494 9535.* Ribbon Valve Springs. Instn Supply 12 Spring Washers E2659. 21/6/12 (1 Card) Furnished with taper valve springs E2654. 12/7/12. | ||