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Richardsons, Westgarth Co, marine, electrical engineers and boiler makers, of Hartlepool
also of Hartlepool Engine Works, Hartlepool; Commercial Street, Middlesbrough; Scotia Engine Works, Sunderland
also of Wallsend, Northumberland
1900 October 29th. Richardsons, Westgarth and Co was registered to acquire the businesses of marine engine and boiler manufacturers of T. Richardson and Sons of Hartlepool, Sir Christopher Furness, Westgarth and Co of Middlesbrough and William Allan and Co of Sunderland . Incorporated as a limited company on the amalgamation of these three companies.
1903 Blowing engine for Clarence Works, Middlesbrough.
1904 Built a blowing engine for Appleby Frodingham Ironworks
1906 Built a blowing engine for Briton Ferry Ironworks
1906 'Messrs. Richardsons, Westgarth, and Co., Ltd., are now completing at their Hartlepool works a 1,000 kw. turbo-generator for the Lisbon Electric Tramways, and they are supplying with this a complete condensing plant, including a Contraflo condenser. They have also supplied Contraflo condensers with a 800 kw. turbo-generator which they have recently sent out Santiago, Chili. They are also supplying 400 kw. turbo-alterantors, as well as a 750 kw. turbine for one of the electrical manufacturing companies. Several condenser contracts are on hand, including installation of Contraflo condensers for the South Durham Steel and Iron Co., Stockton-on- Tees. The marine department is well supplied with work. An order for engines was booked last week from a Cardiff firm. At their Sunderland works, the firm have just secured an order from Messrs. Robert Stephenson and Co., Limited, of Hebburn-on-Tees, for a set of engines, 23in. by 32in. by 62in, by 42in., duplicate of engines supplied to the s.s. Alga for the same owner. They have also received another order for a set of engines, 25in. by 41in., by 69in. by 48in. from the Northumberland Shipbuilding Company, Ltd., duplicate of eight other sets now on order for this firm. This is the fifth set of these engines which have been ordered for the Midgard Steamship Company, Bremen.'
1914 Directory: Listed as Boiler Makers 
1914 Marine, electrical and general engineers and boilermakers. Specialities: marine engines and boilers, turbines and turbo generator sets, gas engines, evaporators, condensing plants. Employees 3,500. 
Makers of 'Nesdrum' water-tube boilers
1924 Advert says they are marine engine builders including steam reciprocating, steam turbine and diesel engines. Head office is Hartlepool with works also at Middlesbrough and Sunderland 
1925 Due to the severe depression in shipbuilding and the marine engineering industry, the company announced in March of 1925 that its works at Middlesborough were to be closed down, and orders from it were obtained by the firm's Hartlepool works. 
1938 the firm of George Clark at Sunderland also joined the group.
1942 Built a blowing engine for Brymbo Steelworks
1947 Recent turbine-alternator orders: Three 52.5 MW sets for Brighton (Southwick 'B') Power Station, two 30 MW sets for Leicester PS, one 60 MW set for Edinburgh.
1956 Atomic Power Constructions was established to tender for nuclear power plant contracts; jointly owned by Richardsons, Westgarth and Co, International Combustion (Holdings) and Crompton Parkinson .
The company did well until the 1960s. By this time the shipbuilding industry in Britain was in decline.
1961 Electrical, mechanical and general engineers; turbo alternators, condensing and feed heating plant and boilermakers. 2,500 employees.
1961 Manufacturers and sale of land and marine steam and gas turbines and gearing; power installations; turbo blowers and compressors; "N.E.M.-Doxford" oil engines; N.E.M. Gotaverken diesel engines; Clark-Sulzer diesel engines; economic boilers an super heaters; sea water and industrial evaporators; ship repairers and dry dock owners. 7,250 employees. 
1982 Richardsons, Westgarth gradually closed its works, and finally went out of business in Hartlepool in 1982.