Grace's Guide is the leading source of historical information on industry and manufacturing in Britain. This web publication contains 135,408 pages of information and 217,020 images on early companies, their products and the people who designed and built them.
Maclea & March of Union Foundry, Dewsbury Road, Leeds, Brass and Iron Founders
1825 Commenced in business when they ordered a cupola from Longden, Newton and Co
1834 Listed as iron and brass founders, flax and tow machine makers and manufacturers of hydraulic presses. Of Union foundry, Dewsbury Road, Leeds. 
Makers of machinery, including machine tools, hydraulic presses and textile machinery (mentioned in various Leeds directories, including White's Directory of 1837)
1884 Special boring machine for Hathorn, Davey and Co of Leeds (see Mechanical World & Steam Users' Journal, 27 March 1884)