-Production of measuring, testing, navigation, optical and photographic instruments and equipment
-Manufacture of machinery and equipment
-Wholesale and retail trade
-Research and development in the field of natural and technical sciences or social sciences
-Mediation of trade and services
-Repair and maintenance of household needs, cultural objects, fine mechanics products, optical instruments and gauges
Installation, repair, inspection and testing of electrical equipment
Manufacture, installation, repair of electrical machinery and apparatus, electronic and telecommunications equipment