6
Building and construction materials and elements of metal; Structures and transportable buildings of metal; Unprocessed and semi-processed materials of metal, not specified for use
19
Building and construction materials and elements, not of metal; Pitch, tar, bitumen and asphalt; Stone, rock, clay and minerals; Precast pavers; Armour-plating, not of metal
37
Construction; Street construction; Construction consultancy; Construction services; Building construction advisory services; Building construction supervision; Services for the redecoration of buildings; Building, construction and demolition; Plumbing installation, maintenance and repair; HVAC (Heating, ventilation and air conditioning) installation, maintenance and repair; Lift and elevator installation, maintenance and repair; Interior and exterior cleaning of buildings; Site preparation [construction]; Extraction of natural resources; Tunnelling; Construction of bridges
42
Engineering services; Structural engineering services; Technological engineering analysis; Technical consulting in the field of environmental engineering; Engineering services in the field of environmental technology; Civil engineering drawing services; Civil engineering planning services; Technical survey services; Technical project planning; Engineering project management services; Process monitoring for quality assurance; Quality assurance consultancy; Design and development of computer software for process control; Design and development of computer software for logistics, supply chain management and e-business portals