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).
Cross-reference note for further information on the Watford SP.12-2 magneto.
| Identifier | ExFiles\Box 43\4\ Scan316 | |
| Date | 31th December 1930 | |
| X.4021. 31.12.30. For further matter relating to Watford SP.{Mr Spinney}12-2 (IS.12) magneto see X.6061. | ||