File cover for a 28 Slot Armature.
| Identifier | ExFiles\Box 68\4\ scan0001 | |
| Date | 18th January 1927 guessed | |
| 8672. RR 68 (250T) (DB {Donald Bastow - Suspensions} 925 S-525) J.H.D. 28 SLOT ARMATURE. | ||
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).