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).
Matched specimen of a special cast iron brake drum from R. Hyde & Son Ltd.
| Identifier | ExFiles\Box 120\1\ scan0330 | |
| Date | 1st October 1935 guessed | |
| Special Brake Drums C/I ex. R.{Sir Henry Royce} Hyde & Son. Ltd. See their letter JRH/JCS/KMH M1156. A1440/1 matched specimen. | ||