Cover note for the attached production test specification for a 20/25 Switchbox.
| Identifier | ExFiles\Box 166\3\ img001 | |
| Date | 20th October 1931 | |
| X6069 By. {R.W. Bailey - Chief Engineer} from Hs {Lord Ernest Hives - Chair} /Pgt. c. Sft {Mr Swift} /Mr.Brock. Hs {Lord Ernest Hives - Chair} /Pgt.1/AD20.10.31. X.6069 X.6016 20/25 SWITCHBOX. X.6087. Herewith please receive Specification of Production Test for the above. Hs {Lord Ernest Hives - Chair} /Pgt. Attached. | ||
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).