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).
Photographs illustrating the application of RETRAC Oil Springs on the suspension of various cars.
| Identifier | ExFiles\Box 46\1\ Scan135 | |
| Date | 1st January 1918 guessed | |
| X4131 Brewster Car with RETRAC OIL SPRINGS mounted outside of frame. Packard Car equipped with RETRAC OIL SPRINGS. Rear Suspension of a Rolls-Royce Car, showing attachment of RETRAC OIL SPRINGS on Cantilever Spring. Rolls-Royce Car, Front Suspension - RETRAC OIL SPRINGS mounted inside of frame. Front Suspension of Delaunay-Belleville Car - RETRAC OIL SPRINGS mounted inside of frame. | ||