43.21.Z - Electrical installation
61.10.Z - Wired telecommunications activities
95.12.Z - Repair and maintenance of (tele)communication equipment
95.11.Z - Repair and maintenance of computers and peripheral equipment
80.20.Z - Security systems service activities
74.10.Z - Specialised design activities
73.11.Z - Advertising agencies activities
71.20.B - Other technical testing and analysis
71.12.Z - Engineering activities and related technical consultancy
62.09.Z - Other information technology and computer service activities
62.02.Z - Computer consultancy activities
26.30.Z - Manufacture of (tele)communication equipment
43.29.Z - Other construction installation
43.22.Z - Plumbing, heat and air-conditioning installation
33.20.Z - Installation of industrial machinery and equipment and outfit
33.14.Z - Repair and maintenance of electrical equipment
33.13.Z - Repair and maintenance of electronic and optical equipment
28.99.Z - Manufacture of other special-purpose machinery not elsewhere classified
28.29.Z - Manufacture of other general-purpose machinery not elsewhere classified
26.70.Z - Manufacture of optical instruments and photographic equipment
26.51.Z - Manufacture of instruments and appliances for measuring, testing and navigation