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).
Product sheet for a Type B.S. Vehicle Roof Ventilator (Air Extractor).
| Identifier | ExFiles\Box 119\3\ scan0168 | |
| Date | 18th August 1931 | |
| COLT VENTILATION LTD. BUSH HOUSE, ALDWYCH, LONDON, W.C.2 (Reproduced by courtesy of “THE MOTOR,” 18th August, 1931) Type B.S. Vehicle Roof Ventilator (Air Extractor) PATENTED | ||