Construction; construction consultancy; operation and maintenance of building equipment; repair, inspection or maintenance of electronic apparatuses and instruments; repair, inspection or maintenance of telecommunication apparatuses and instruments; repair, inspection or maintenance of measuring apparatuses and instruments; repair, inspection or maintenance of non-electric cooking heaters; repair, inspection or maintenance of cooking pots and pans; rental of valves [machine elements], tap water faucets, water-pipe valves [not of metal or plastics]

Educational and instruction services relating to arts, crafts, sports or general knowledge; arranging, conducting and organization of seminars; providing electronic publications; services of reference libraries for literature and documentary records; rental of books; publication of books; production of videotape film in the field of education, culture, entertainment or sports [not for movies or television programs and not for advertising or publicity]; rental of records or sound-recorded magnetic tapes; rental of image-recorded magnetic tapes; rental of cameras

Architectural design; surveying; designing of machines, apparatuses and instruments [including their parts], or systems composed of such machines, apparatuses and instruments; computer software design, computer programming, or maintenance of computer software; consultancy in the field of computer software design, computer programming, or maintenance of computer software; technological advice relating to computers and industrial machines; rental of measuring apparatus; rental of computers; providing computer programs on data networks; rental of solenoid or amplifying valves; rental of optical machines and instruments

Heating systems, vacuum steam heating systems; parts and fittings for all the aforesaid goods