Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 132,775 pages of information and 210,006 images on early companies, their products and the people who designed and built them.
Crofts (Engineers) of Thornbury, Bradford.
formerly Croft and Perkins
1927 Advert for power transmission appliances.
1936 Advert for belt, rope, chain and gear drives for the textile industry.
1937 Power transmission specialists. "Perfect" Flexible Couplings. "Semiflex" Flexible Couplings. "Varispeed Pulleys" for V-rope Drive. 
1940 Advert for belt, rope, chain and gear drives.
1941 Private company.
1945 Advert for transmission appliances. makers of shafting, couplings, bearings, fixings, pulleys, clutches and much more.
1961 Iron founders.