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John Lang and Sons of Johnstone, nr Glasgow were machine tool manufacturers.
1873 Company founded.
1894 Surfacing and boring Lathe. 
1895 Visit to the works by a party from the Institution of Mechanical Engineers
1911: 12 inch Centre Lathe. 
1916 Private company.
1920 September. Exhibited at the Machine Tool and Engineering Exhibition at Olympia with a number of lathes with their well-known system of variable speed driving by means of expanding pulleys. 
Member of Associated British Machine Tool Makers
1959 Formation of Lang Gisholt Machine Co. Ltd to manufacture the complete range of lathes and power-operated chucks for John Lang and Sons Ltd and the complete range of machine tools for Gisholt (Great Britain) Ltd.
1961 Lathe manufacturers, machine tool makers and engineers. 800 employees.