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).
Specification sheet listing design numbers, details, and remarks for various parts.
| Identifier | ExFiles\Box 174\3\ img253 | |
| Date | 5th December 1940 guessed | |
| SPECIFICATION Nº PL428 ISSUE Nº 1 SHEET Nº 10 DESIGN Nº DETAILS L.O.P. REMARKS. PL375 DESIGN REQD PL421 DW536 OPEN TYPE FUSE PL347 PL421 LTD M 40 | ||