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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. 
1961 Lathe manufacturers, machine tool makers and engineers. 800 employees.