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Fossick and Hackworth of Stockton-on-Tees.
1839 The company was founded by Thomas Hackworth, brother of Timothy Hackworth, and George Fossick. They bought premises from Jacob Waller in Norton Road, Stockton that had previously been used as a flour and saw mill.
1839 First locomotives built.
1851 Fossick and Hackworth listed as Engineers and Ironfounders of Stockton Iron Foundry, Norton Road 
1852 Their yard at Thornaby was acquired by the South Stockton Iron Ship Building Co
1853 Supplied the first pair of marine engines for the first two iron ships built at Stockton. These were built under the direction of Robert Thorman who died soon after; eventually marine engineering replaced the railway work.
1855 Fossick and Hackworth listed as Ironfounders and Steam Engine Manufacturers at Norton Road, Stockton 
1855 George Y. Blair joins the company
1858 Fossick and Hackworth listed as Engine Builders and Ironfounders of Coxhoe, Ferry Hill and Norton Road, Stockton 
1864 The last locomotive built by the company was Victor for the Llanelly Railway
1864 Thomas Hackworth retired and the company became Fossick, Blair and Co when George Blair the Works Manager became a partner.
1866 The company became Blair and Co when George Fossick retired
Around 120 locomotives were built by this company.