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).
List of signatures for Certificates of Security and the return of unused certificates.
| Identifier | ExFiles\Box 138\3\ scan0252 | |
| Date | 20th December 1935 | |
| X1162 To D/L. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}5/KW.2.1.3 6. Certificates of Security. D/DL.20.12.35. We attach the list of signatures for Certificates of Security. We are returning herewith Certificates Nos. 80, 81 & 82, as these are not required. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||