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).
Performance of a supplier named Prices regarding their oil cleaning methods.
| Identifier | ExFiles\Box 144\1\ scan0275 | |
| Date | 1st April 1937 | |
| S/W -2- C3/C1.4.37 We feel that we do not want to be unfair to Prices after dealing with them for such a long period unless we are absolutely convinced that they are backward with their cleaning of oils and have got to be forced to be more up-to-date. C. | ||