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Halma plc is a group of technology companies that makes products for hazard detection and life protection. It is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index.
The Company was established in 1894 in Ceylon as The Nahalma Tea Estate Company Limited.
1937 Switched to rubber production and became The Nahalma Rubber Estate Company Limited.
Early 1950s: the Company's rubber estates were nationalised by the Sri-Lankan government
1956 Company became Halma Investments Limited, severing its connections with both tea and rubber and becoming an investment and industrial holding company
Early 1970s the company began a sequence of acquisitions in the mechanical, electrical and electronic engineering sectors.
1973 The Company was renamed Halma Limited
Late 1970s Acquired Hanovia
1982 Had a turnover of £16.5 million and employed 868 on six UK sites and three overseas. Based in London. Manufacturing for industrial safety, security and environmental control markets. Company chairman was David Barber.
1990 Acquired Cressall Manufacturing Co
2003 Acquired Radcom (Technologies)
2015 Halma Plc. Revenue £726m. Employs 5,400 persons worldwide of whom 37% are in the UK. 
2017 Formed the Halma UV Group by combining Berson (Netherlands), Hanovia and Aquionics (USA).