Sketch showing the placement and dimensions of a 'Colt K extractor' ventilator on a car bonnet.
| Identifier | ExFiles\Box 119\3\ scan0177 | |
| Date | 10th November 1931 guessed | |
| Colt 'K' extractor 18" long. maximum projection - 1/2" 15" COLT VENTILATION LTD. BUSH HOUSE. ALDWYCH. W.C.2. | ||
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).