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).
Cover page regarding temporary electrical units on the 23-EX chassis.
| Identifier | ExFiles\Box 169\1\ img009 | |
| Date | 1st February 1929 | |
| (9) RHC{R. H. Coverley - Production Engineer}8/MS14 -2.29. Electrical Unit. Temporary Electrical Units on 23-EX. RHC.{R. H. Coverley - Production Engineer} | ||