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Greens of Smithfield Ironworks, North Street, Leeds, and New Surrey Works, Southwark Street, London S.E. Sometimes and Sons (Plural)
1835 Company started.
1848 Thomas Green bought a site and founded the Smithfield Ironworks.
1862 Incorporated as a Limited Company.
By 1866 was operating as Thomas Green and Son Ltd (see advert)
1879 Private company. The company was registered on 14 June, to take over the business of the firm of the same name, as engineers, ironfounders and machinists. 
1880s Started building locomotives.
1885-98 157 tram locomotives built.
1885 Advertising that they were the sole licensees of The Steel horizontal gas engine in four sizes
1895/6 Manufacturing the Smithfield range of gas engines rated from 1 to 12 hp 
1905 Advert. Vertical, Cornish and Lancashire boilers. Of Smithfield Ironworks, Leeds and New Surrey Works, Southwark Street, London SE. 
1906-11 Built six steam tractors.
1913-1917 For a list of the models of mowing machines and prices see the 1917 Red Book
1914 Specialities: Lawn Mowers, Garden Rollers, Steam Tractors, Steam Road Rollers, Motor Rollers, Motor Street Sweeping Machines and Locomotives. 
1920 The last of the railway locomotives was built. The total was 38 in the life of the business. More than 200 tram engines were built.
Built steam road rollers from 1890s to late 1920s and five of these are preserved.
1937 Engineers. 
1939 See Aircraft Industry Suppliers
1961 General engineers, manufacturing lawn mowers, garden rollers, steam rollers and general agricultural implements. 520 employees. 
1975 Company bought by Atkinson of Clitheroe.