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of London and Trowbridge, Wiltshire, heating and electrical contractors, which later became the Haden Group.
1816 Company founded presumably as George and James Haden
1855 Became George Haden and Son
1914 Heating, ventilation and general engineers. Specialities: heating, ventilation, hot and cold water supply, electric lighting and power plants, cooking and laundry plants, experts on heat economy. 
1919 Private company.
1921 Company made public.
1926 Received an order to furnish the heating equipment for Carliol House, Newcastle. The method adopted is the lower-pressure hot water panel system, large thermal storage cylinders, containing elements for heating up the water by means of electricity, being employed. The idea is to take current from the local electricity supply at times of small demand at the generating station, when power is obtainable at specially small cost.
1937 Heating and ventilating engineers. 
1961 Heating, air-conditioning and piping and sanitary engineers. Products include: warm and cool air; industrial process services. 3,000 employees. 
Mid-60s marked a nadir in profits after which the company got a better grip on its businesses
1970 Acquired Carrier Engineering Co
1971 The main operating subsidiary, Haden Young, mechanical services supplier, won a contract for air conditioning, heating and fire protection in an 18 storey building and many other such contracts.