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).
Blueprint showing two views of a P.II. Low Inertia Crankshaft Damper.
| Identifier | ExFiles\Box 137\4\ scan0177 | |
| Date | 21th January 1931 guessed | |
| P.II. LOW INERTIA CRANKSHAFT DAMPER PLATE .075 THICK. X Y A | ||