1818 LESER is founded as a brass foundry in Hamburg-Neustadt by Georg Wittmann.
1856 John Ramsbottom invents a flanged spring safety valve.
1884 LESER offers the complete product range of steam fittings, including safety valves.
1914 The company expands and acquires the property in Wendenstraße.
1943 Production is moved to Hohenwestedt.
1944 André Ramseyer AG is founded in Flamatt / Switzerland, in which LESER holds a share.
1959 The first component test is carried out and successfully completed.
1970 LESER specializes in safety valves.
1980 LESER is market leader in the field of safety valves in Germany and Europe.
1987 FAINGER-LESER is founded in Mumbai / India as a joint venture.
1990 LESER receives the first ASME certification and can thus operate worldwide.
1998 Protego LESER do Brasil is founded in Brazil.
2001 LESER introduces the API product group as an important step towards a global presence.
2003 LESER LLC is founded in Charlotte, NC / USA.
2004 LESER S.A.R.L. is founded in France.
2008 LESER Middle East is founded as an office in Bahrain.
2010 LESER introduces the pilot operated safety valve.
2010 LESER LLP is founded in Singapore.
2013 LESER - The Safety Valve (Tianjin) Ltd. is founded in Tianjin, China.
2017 LESER introduces the change-over valve.
2018 200 years of LESER