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).
Special parts, specifically the gearbox with Hoffmann Ball Bearings, fitted to chassis 21COE.
| Identifier | ExFiles\Box 20\7\ Scan021 | |
| Date | 4th December 1912 | |
| TBB1C/L41212 December 4th 1912 Report on Special Parts fitted to Chassis 21COE. 10, GEAR BOX :- This is fitted with Hoffmann Ball Bearings, and compared with the present average the gears and the side shaft are very good as regards silence. Z 515- | ||