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).
To Mr. Brock regarding the return of three coil cases which passed testing.
| Identifier | ExFiles\Box 45\4\ Scan312 | |
| Date | 15th September 1927 | |
| X4079 To Mr. Brock. EFC4/T15.9.27. Herewith we return to you the three coil cases recently sent to us for test. We find these to be O.K. EFC. | ||