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).
Diagram showing the attachment of RETRAC Oil Springs on a Cantilever Spring for a rear suspension system.
| Identifier | ExFiles\Box 46\1\ Scan123 | |
| Date | 1st January 1919 guessed | |
| Rear Suspension of a Rolls-Royce Car, showing attachment of RETRAC OIL SPRINGS on Cantilever Spring. THE RETRAC OIL SPRINGS | ||