Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 146,759 pages of information and 232,400 images on early companies, their products and the people who designed and built them.
of Imperial Works, Keighley.
1908 Founded at the Alexandra Works, Keighley to produce gas, oil and spirit engines. main director was Robert Clough
1911 Company moved to Imperial Works
1914 Manufacturers of "Imperial" horizontal and vertical gas, oil and spirit engines; suction gas plants. 
1919 The CD model introduced rated at 9 bhp.
c1928 Company went into liquidation.