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 electrical components and their corresponding part numbers.
| Identifier | ExFiles\Box 169\1\ img026 | |
| Date | 13th June 1929 | |
| (2) RHC{R. H. Coverley - Production Engineer}/FW4/WS13.6.29 Ignition Terminal Box - L.O.P. D.60718. Automatic Switch - L.O.P. D.71810.- LeC 2620. Disconnecting Box - L.O.P. D.70855. Duplex Push Button Switch - L.O.P. D.71122. RHC{R. H. Coverley - Production Engineer}/FW. | ||