Founded in 1965 as a temperature control manufacturer by an innovative group of directors in Worthing, West Sussex, UK, the company soon expanded into adjacent technology areas. Independent companies were set up to manufacture Data Recorders (Chessell Ltd), Control Systems (TCS / Turnbull Control Systems), and Variable Speed Industrial Drives (SSD / Shackleton System Drives). All four companies achieved international success and in 1974 were brought under a single international holding company, Eurotherm International.