Illustration of an Opel front suspension system.
| Identifier | ExFiles\Box 154a\2\ scan0257 | |
| Date | 14th March 1940 guessed | |
| Fig. 7. — Suspension avant Opel. P.T.O. | ||
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).