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).
With a purple ink stamp from the print room in Derby.
| Identifier | WestWitteringFiles\V\2January1931-April1931\ Scan022 | |
| Date | 4th February 1931 | |
| CONTROL, LIMITED PRINT ROOM, 4 FEB 31 DERBY. | ||