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of Bonlea Foundry, Thornaby-on-Tees, Cleveland. Telephone: Stockton 66121/2. Telegraphic Address: "Bonlea, Thornaby-on-Tees"
and at Springbank Ironworks, Maryhill, Glasgow, Scotland.
1848 Bon Lea Foundry was founded by Thomas Allan and Sons of Glasgow, as a works for making gas, water and drain pipes.
1876 At the time of the death of Thomas Allan, the firm was carrying on business at the Springbank Ironworks, Glasgow, and at Bonlea, South Stockton-on-Tees
1892 Employed 200.
1893 Dissolution of the copartnership of Thomas Allan and Sons, Iron-founders, of 24, George-square, Glasgow, and Bonlea Foundry, South Stockton-on-Tees, by the retirement of James Stevenson M'Ewen. The business was carried on by the other partner James White, under the same firm
1900 The company was registered on 30 November, to acquire the business of ironfounders of the firm of the same name. 
c.1909 Taken over by Allan Ure and Co.
1936 Became a subsidiary of Federated Foundries but retained its name until 1964.
1937 Listed Exhibitor - British Industries Fair. Brick Set "Waltham" Horizontal Tubular Boiler for Heating Apparatus in Glasshouses. Hot Water Pipes and Flanged Pipes for Steam and Water Ranges. General Castings for Engineering Trades. (Stand Nos. B.909 and B.810) 
1968 Company put into liquidation