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).
Disassembled view of filter components laid out on a board.
| Identifier | ExFiles\Box 136\3\ scan0095 | |
| Date | 9th October 1940 guessed | |
| Filters | ||