71.12.Z - Engineering activities and related technical consultancy
33.20.Z - Installation of industrial machinery and equipment
43.21.Z - Electrical installation
43.29.Z - Other construction installation
71.20.B - Inspection and issuance of opinions on the technical condition of chimneys and ventilation ducts
72.1 - Research and experimental development on natural sciences and engineering
74.90.Z - Other professional, scientific and technical activities not elsewhere classified
82.30.Z - Organisation of conventions and trade shows
85.59.B - Courses and training related to acquiring knowledge, skills, and professional qualifications in non-school forms
94.99.Z - Activities of other membership organisations n.e.c.