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Stone quarries, of Matlock, Derbyshire
1935 Company formed to bring together stone quarrying assets of Constable Hart and Co, J. Hadfield and Sons, and Caldon Low Quarries, as well as the whole of Greatorex and Son, and Hopton Wood Stone Firms, and Hartington Quarries.
1936 Public company incorporated.
1959 Acquired Baird and Tatlock (London).