Telegram concerning piston rings for the 20 horsepower and Phantom models.
| Identifier | ExFiles\Box 15\3\ Scan019 | |
| Date | 23th July 1928 | |
| Hives Roycar Derby. Very anxious about piston rings stop understand plain rings will be used at once on 20 horsepower production but phantom still depend on our L. shape stop suggest piston | ||
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).