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).
Record of Hightensite and Ebonite moulding samples with inserts sent by post.
| Identifier | ExFiles\Box 34\2\ Scan064 | |
| Date | 8th October 1919 | |
| X.2625 03337 8.10.19. Post 1 Pd. Hightensite Ltd. London. Sent to O.O. Samples of Hightensite and Ebonite Mouldings with Inserts. 3 Ebonite with inserts 1 Hightensite " " | ||