Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 148,535 pages of information and 233,960 images on early companies, their products and the people who designed and built them.
Blackman Ventilating Co of Bradford, Bristol, Glasgow, London and Manchester.
1883 The Blackman Ventilating Co was formed.
1890 The company was registered on 10 July, as the Blackman Ventilating Co. 
1891 Ventilation systems. 
1894 June. Royal Agricultural Society's Show. Several fans, some driven by the 'Trusty' engine.