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).
Performance graph for a Colt K.K. Fan showing HP and Air Volume curves.
| Identifier | ExFiles\Box 119\3\ scan0188 | |
| Date | 25th November 1931 guessed | |
| COLT K.K. FAN H.P. AIR VOL. 1000 2000 3000 4000 | ||