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).
The requirement to fit and test a standard Wraith petrol filter on B.60 units.
| Identifier | ExFiles\Box 161a\1\ scan0108 | |
| Date | 24th April 1940 guessed | |
| Ru. remarked that a petrol filter is required for B.60 units. He suggested that a standard Wraith filter should be fitted. It was agreed that this filter will be tested on the bed and on the road. Ru. | ||