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of York Street Works, Lambeth, London, SE.
1880 Company established by William Henry Allen at York Street Works, Lambeth, London.
1881 Employing 55 men 
1889 William took his son Richard into partnership.
1893 Son Richard retired
1894 Queen's works constructed at Bedford; business moved there from Lambeth. Name changed to W. H. Allen Son and Co.
1894 Catalogue of Condensing plant. (W. H. Allen of Lambeth). 
1900 Incorporated as a limited company (W. H. Allen Son and Co Ltd). The company was registered on 29 July, to acquire a business of mechanical, hydraulic and electrical engineers. 
1900 Catalogue of two-crank enclosed compound engine. 
1904 Supplied steam-driven centrifugal pump for Kobe Floating Dock, Japan. 
1908 Two sets of irrigation pumps supplied to Egypt consisting of compound steam engines and a turbine pump in one case and a Conqueror pump in the other.
1914 Mechanical, hydraulic and electrical engineers. Specialities: high-speed steam engines, centrifugal pumps and pumping engines for irrigation, drainage etc.; auxiliary machinery in connection with warships and the mercantile marine; independent condensing plants, turbine pumps, motors and dynamo electric machinery. Employees 1,000. 
1920 Name changed to W. H. Allen, Sons and Co Ltd