 During the 1920s, the industrial expansion of the region continued with the radium and copper factories in Olen, the glass factory in Mol-Gompel and the diamond industry in Grobbendonk and Nijlen.In the 20th century the first nuclear installation in Belgium was established at the SCK•CEN in Mol in 1962.The European Institute for Reference Materials and Measurements (IRMM), one of the EU Joint Research Centres, was founded in Geel in 1957 as a result of the Treaty of Rome.