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).
The customer cost for fitting helical gears to old type 40/50 chassis.
| Identifier | ExFiles\Box 45\3\ Scan090 | |
| Date | 24th August 1921 | |
| Hs.{Lord Ernest Hives - Chair} from Rg.{Mr Rowledge} 24.8.21. HELICAL GEARS TO OLD TYPE 40/50 CHASSIS. Prior to chassis No.1550 £34. 0. 0 charged to customer including profit. From chassis No.1550 to 2299 £31. 15. 0 " " " " D/Rd. 23.8.21. | ||