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Edward Green and Son of Wakefield and Manchester
1826 Company founded.
1845 Green's Economiser was invented 
1851 Employing 30 men.
1861 Employing 200 persons.
1895 130,000 Green's Economisers had been installed
1913 A complete reorganisation of the Wakefield works, said to be the largest of its kind in the world, was underway
1914 Manufacturers of fuel economisers for steam boilers to utilise waste heat in flue gasses, boiler feed pumps and small horizontal steam engines, air heaters. Employees 1,000. 
1923 Sir Edward Green (1831-1923), son of the founder, died. His elder son, Edward Lycett Green, succeeded to the title. His second son, Francis Green who had started with the company in 1880, became chairman
1927 Economiser. 
1933 Private company formed to acquire a company of similar name
1958 Public company
1961 Manufacturers of fuel economisers, air heaters and all types of heat exchangers, industrial dust collectors, mechanical draught fans and specialised castings. 1,000 employees. 
1966 Diversification into other markets than large stationary plant with order from Norwegian shipbuilder for 7 economiser units to fit to diesel engine exhausts
1968 Company results reported as Green's Economisers. E. Green and Son became a wholly-owned subsidiary of Green's Economisers.
1971 Expansion into air-cooled heat exchangers for the chemical industry
1983 Senior acquired Green's Economiser Group plc