19 Building materials (not of metal), non-metallic rigid pipes for building, transportable buildings not of metal, monuments not of metal, dry cement.
41 Arranging and conducting of conferences, congresses, symposiums; publication of texts (other than publicity texts); education services; publication of books; organisation of competitions, competitive examinations.
42 Quality-control services; services provided by engineers dealing with appraisals, valuations, research and surveys; architectural consultancy; arbitration services; security consultancy, environmental protection consultancy; research and development of new products for others; computer programming services.
