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 document for the 20/25 distribution box and cut-out.
| Identifier | ExFiles\Box 57\1\ Scan012 | |
| Date | 31th December 1930 | |
| X.5740. 31.12.30. For further matter relating to 20/25 distribution box (general) see X.6067 and 20/25 cut-out (general) see X.6123. | ||