Construction, maintenance and renovation of buildings and consultancy services thereof; construction services; building construction supervision; construction consultancy; installation, maintenance and repair of building equipment and consultancy services thereof; repair or maintenance of security surveillance installations and burglar alarms and consultancy services thereof; repair or maintenance of fire alarms and consultancy services thereof; repair or maintenance of air conditioners for industrial purposes and consultancy services thereof; repair or maintenance of burners and consultancy services thereof; repair or maintenance of boilers and consultancy services thereof; repair or maintenance of pumps and consultancy services thereof; repair or maintenance of freezing machines and apparatus for industrial purposes and consultancy services thereof; repair or maintenance of electric motors and consultancy services thereof; repair or maintenance of power distribution or control machines and apparatus and consultancy services thereof; repair or maintenance of power generators and consultancy services thereof; cleaning of building exterior surfaces, window cleaning, carpet and rug cleaning, floor polishing and consultancy services thereof.

Architectural design; surveying; engineering services in the field of building technology; geological surveys; designing of machines, apparatus, instruments or systems composed of such machines, apparatus and instruments; design services; design, programming and maintenance of computer software; technological advice relating to computers, automobiles and industrial machines; research on building construction or city planning; research and scientific analysis in the field of environmental conservation and consultancy services thereof; testing and research services in the field of preventing pollution; testing and research services in the field of electricity; testing and research services in the field of civil engineering; testing or research on machines, apparatus and instruments; rental of computers; providing non-downloadable computer programs on data networks; rental of technical drawing instruments.