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H. D. Pochin and Co Ltd, clay producers, of Worsley Street, Salford.
Henry Davis Pochin invented a process using ammonium sulphate and alumina as a low cost alternative to alumstone in the production of alum cake used in the manufacture of paper. The process required china clay. Pochin bought several china clay mines in Cornwall for this purpose.
In time H. D. Pochin and Co became one of the three largest British producers of china clay