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Guest and Co, colliery owners
1833 The price of Merthyr coal from Guest and Co was advertised
1839 Guest and Co owned the 19 furnaces at Dowlais
1848 William Price Lewis, a partner in the firm of Sir John Josiah Guest and Co and owning 5 sixteenths of the business, left his estate to his nephew William Wyndham Lewis although this took several years to decide by the courts
1851 The partnership between Sir John Josiah Guest and Edwin John Hutchins, ironmasters, miners and merchants of Dowlais, Cardiff, London, Liverpool and Mitcheldean, under the styles or firms of Dowlais Iron Co, and Guest, Lewis and Co, and Guest and Co, was dissolved.
1867 A fatal accident occurred when a fall of coal took place at Penydarren Colliery, which belonged to Guest and Co.
1900 Patent Nut and Bolt Co, controlled by Arthur Keen, amalgamated with the Dowlais Iron Co and Guest and Co, both controlled by Lord Wimborne; this would give Keen's company its own coal and iron supplies and a diversified range of products; the company would be called Guest, Keen and Co