 The background for the establishment was the new railway line that ran past Lørenskog, giving easy access to lumber from the inner parts of the country, as well as to the port in Oslo.The mills were owned proprietorially until they incorporated as the limited company "A/S Fjeldhammer Brug" in 1893, and the company has today become part of Icopal.Wincentz Thurmann Ihlen established his own mechanical workshop and iron works at Strømmen in 1873, under the name "W. Ihlen, Strømmen".