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of 75 Queen Victoria Street, London EC
1889 Private company.
1890 Name changed to Sturtevant Engineering Co
1895 Advert. Heating and ventilating systems. formerly Sturtevant Blower Co.
1899 Limited company status
Manufactured electrical switch gear under the Igranic name until 1906
1904 Acquired Electrical Transmission Co of Hammersmith, maker of switch gear
1911 Entered the crushing and grinding machine business, under licence from US
1913 The switch-gear business was transferred into a separate company Igranic Electrical Co.
1917 Subsidiary E. Reader and Sons of Nottingham incorporated
Post-WWI The company was mad independent of the US parent to meet Government requirements
By 1930 the company was still producing most of the US range of fans, in addition to the British crushing, grinding and screening machinery and cash tube systems.
1944 Company made public.
1946 The whole of the share capital was made available for purchase
1961 Mechanical and electrical engineers, manufacturing fans of all types, including plants for air conditioning, heating, ventilating, drying, fume removal, vacuum cleaning, electrostatic precipitation, crushing and grinding. 
1965 Drake and Gorham, Scull acquired Sturtevant Engineering Co; Sturtevant was reorganized into two separate companies with the air-conditioning, ventilating and process heating activities transferred to a new company, Sturtevant Air Treatment Ltd.
1975 The flue gas cleaning business was sold to Peabody International Corporation., becoming a new subsidiary, Sturtevant Gas Cleaning Ltd.
1976 The agricultural division, based in Ipswich was acquired by management and renamed Sturtevant-Roote Ltd. They designed and installed process machinery for the feed, food and malt trades. The business was dissolved around 1998.
1978 Company was reorganized into Sturtevant Engineering Holdings Ltd and Sturtevant Welbeck
Shortly afterwards Sturtevant Welbeck was split into separate divisions: Sturtevant Engineering & Manufacturing Ltd. (portable vacuums) and Sturtevant Systems Ltd. (fixed vacuum systems).
1983 Christy Turner Ltd. acquired Sturtevant Engineering Holdings.
1984 The industrial fan division was sold to Matthews and Yates Ltd.
1994 Both vacuum divisions were sold to the Scotland-based Clyde Blowers, formerly a small blower company that was transformed into an industrial investment firm after a management buyout in 1992, and renamed Clyde Sturtevant. Eventually assets were transferred to Clyde Material Handling Ltd., which organized a new Sturtevant vacuum division in South Yorkshire.