Arne Gjerde established the Gjerdesagen concept.
Gjerdesagen production is increased in Drøbak, Norway at Jens A. Schou Mek. Workshop.
In 1958, a world patent was obtained and the saws were licensed abroad.
In 1983 the production of Gjerdesagen saws was moved to A / S Jøtul in Tistedal.
In 1990, the company changed its name to what we know it as today, Ernex AS.
In 2011 Grimstål Produkter becomes a part of the Eagle-Group.
In october 2018 Ernex AS and Grimstål Produkter merge into one company under the name Ernex AS.