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of South Wales Works, Llanelly, Carmarthenshire, and North Lindsey Works, Scunthorpe
1871 Richard Thomas spent time as the general manager and secretary at the Ynyspenllwch Ironworks before the formation of Richard Thomas and Co to acquire and run the idle Lydbrook tin plate works in Gloucestershire.
1875 Purchased the Lydney works.
1877 Purchased the Lydbrook colliery.
1883 Financial difficulties and eventual liquidation, due mainly to problems of flooding at the colliery.
1884 Relaunched the company with the help of the Barrow Hematite Steel Co with Thomas as managing director of the new concern and his eldest son, Richard Beaumont Thomas, as general manager. Incorporated as a limited company.
1888 he acquired, in conjunction with William Thomas Lewis and others, the Melingriffith Tin Plate Works on the outskirts of Cardiff.
1914 Tinplate Manufacturers, Iron, Steel and Brass Founders. Specialities: Iron, steel and brass castings, chilled mill and cold rolls, sulphuric acid for tinplate making, green copperas (sulphate of iron), coke and charcoal tinplates, tin and terne-coated sheets, Canada plates. 
By 1916 the various companies associated with Richard Thomas and Co employed over 11,000 workers and controlled a quarter of the tin plate mills in South Wales.
1917 Took over the Cwmfelin Steel and Tinplate Works.
1923 Largest tinplate makers in the world; owned 14 tinplate works with 111 mills, capacity of 4,500 tinplate and 6,500 tons of steel per week. Working arrangement agreed with Grovesend Steel and Tinplate Co which led to purchase of control of Grovesend
1927 Scunthorpe plant consisted of 4 furnaces with a total capacity of 3,500 tons per week.
1927 See Aberconway Chapter IV for information on the company and its history.
1927 See Aberconway Chapter XVII for information on the company and its history.
1930 Scunthorpe Works closed due to trade depression.
1931 The other 4 works resigned from the South Wales Tinplate Corporation.
1933 Agreement with Whitehead Iron and Steel Co to supply billets from Redbourn works at Scunthorpe to that company's Newport rolling mills; Mr L D Whitehead to join the Richard Thomas and Co board.
1933 A jointly-owned company was formed by Whitehead Iron and Steel Co and Richard Thomas and Co called Whitehead Thomas Bar and Strip Co. This company would operate a finishing mill at Redbourn, equipped by transferring the semi-continous mill from Whitehead's Tredegar works
1935 Sir William Firth, Chairman of Richard Thomas and Co announced that his company had purchased the assets of the Ebbw Vale Steelworks and that the first continuous hot strip mill outside the USA would be located there.
1937 British Industries Fair Advert for Welsh Tinplate Works. Includes the following: Abercarn Works, Cynon Works; Aberdulais Tinplate Co, Aberdulais, near Neath, Glamorgan; Aber Works, Edlogan Works; Bryn Works; Burry Works, Ely Works; Cardonnel Works; Cilfrew Works, Lydney; Cwmbwria, South Wales Works; Cwmfelin Works; W. Gilbertson and Co, Pontardawe, Glamorgan; Glynbeudy Works; Glanrhyd Works; Melingriffith Co, Melingtiffith Works, Cardiff; Morfa Works; Treforest Works. (Engineering/Metals/Quarry, Roads and Mining/Transport Section - Stand No. D.328). Of Bush House, Aldwych, London, WC2. 
1945 Despite the opposition of the previous chairman, Sir William Frith, Richard Thomas and Co merged with Baldwins Ltd creating Richard Thomas and Baldwins an organisation of some 27,000 employees.