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).
Supply status of Ferranti ammeters for F Benti matters.
| Identifier | ExFiles\Box 168\5\ img197 | |
| Date | 31th October 1930 | |
| X3498 LFC. 31.10.30. F BENTI MATTERS. X.3498. A number of Ferranti ammeters are on order but are not yet supplied on production. CJ. | ||