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).
Sketches and notes for a suggested locking bolt for a Firestone spring ring.
| Identifier | ExFiles\Box 42\4\ Scan140 | |
| Date | 5th June 1920 | |
| Mr. Hives June 5/20 Bolt in place (Section) lockwasher Bronze nut Bolt 1/4 hitch on ends of ring for bolt head. Suggested locking bolt for Firestone Spring Ring by June 5 '20 | ||