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).
Test results for multiple storage batteries to be sent to Messrs. Hobson.
| Identifier | ExFiles\Box 41\2\ Scan108 | |
| Date | 6th May 1920 | |
| X.3711 EFC/AT6.5.20. X.3/11.-MULTIPLE STORAGE BATTERIES. The result of tests on the above batteries should be forwarded to Messrs. Hobson. EFC. | ||