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).
Request to receive two 40/50 dynamos, D.71914, for testing.
| Identifier | ExFiles\Box 68\4\ scan0119 | |
| Date | 14th November 1928 | |
| X8664 EFC. 14.11.28. Please receive 2 40/50 dynamos D.71914 (higher output machines) for testing. No.3. N.B. HO. 4. N.B. HO. B Wolstenholme. | ||