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Makers of thermostats and shower valves, of Cheltenham and 20 Queen Elizabeth Street, London, SE1
1921 Company founded in London
1926 They moved from Dane's Inn House, 265, Strand, W.C.2 to 54-58, Queen Elizabeth-Street, London, S.E.I..
1926 - October. They were appointed sole British representatives of Lewis M. Ellison of Chicago, U.S.A., the manufacturer of the Ellison inclined draught gauges for use on boiler and other power plants.
1936 Introduction of Leonard thermostatic mixing valve
1937 Engineers and instrument manufacturers. Factory established in Cheltenham.
1959 First thermostatic mixing valves developed capable of working on UK supply pressures
1976 Miralec thermostatic shower introduced. Leonard brand discontinued