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Thomas Dunn & Co of Windsor Bridge Iron Works, Salford, Manchester
Note: In 1848 the proprietors of Windsor Bridge Iron Works were Dunn and Elliott. They made a hydraulically-operated chain cable testing machine for Hingley and Sons of Cradley Chainworks and Salthouse Dock, Liverpool. It was tested in the presence of Mr Fothergill, W. Mayburn [Walter Mabon] of the Ardwick Iron Works, Mr Barlow, Mr Booth of Joseph Whitworth and Co, and others.. Note: 'W. Meyburn' was Walter Mabon.
1848 Thomas Dunn of Windsor Bridge Iron Works wrote to The Practical Mechanic's Journal describing his use of a portable coffer dam for setting the piers for the Springfield Bridge over the River Irwell. The coffer dam comprised a pair of concentric wrought iron cylinders 6ft 6ins and 9ft diameter, 8 ft high. The central pier had stone five columns in the middle of the river, each having its bed prepared and the pillar constructed within the coffer dam, after which the dam was moved for construction of the next pillar in about 18 hours.
1862 At the London Exhibition, Thomas Dunn & Co exhibited examples or models or drawings of a wide range of equipment, as listed here: 1862 London Exhibition: Catalogue: Class V.: Thomas Dunn and Co.
1862 Supplied a hydraulic testing machine to Lloyd’s Register at London’s West India Docks, for proof testing chains up to 450 ft long.
1863 Advertising as manufacturers of Railway Plant in all its details, Boilers, Bridges, Barges, Dock Work and Roofing; Cranes, Caissons, Crabs, Hoists, Jacks, &c; Engines, horizontal, vertical and traction; Fans, Blast engines, Forges, Furnace fittings &c; Hammers, steam and tilt, Pile Drivers &c; Lathes, Boring, Turning, Planing & Shaping Tools; Machines, Sawing, Weighing, Forcing, Pressing &c; Traversers, Turntables, Tanks &c. 
1865 Prospectus issued for a new company to be formed with the title Thos. Dunn and Co. (Limited). The company was established to purchase the blast furnace and goodwill of the old established firm at Windsor Bridge, Salford.