repair or maintenance of construction machines and apparatus; repair and maintenance of electronic apparatus; maintenance and repair of medical apparatus; installation, maintenance and repair of building automation equipment; maintenance and repair of electrical apparatus; repair or maintenance of telephone apparatus; installation, maintenance and repair of measuring, signalling and monitoring apparatus and instruments; installation, maintenance and repair of measuring and testing apparatus and instruments; installation, maintenance and repair of measuring apparatus; installation, repair and maintenance of measuring, signaling and monitoring apparatus and instruments; installation, maintenance and repair of electrical and electronic measuring and testing apparatus and instruments; installation, maintenance and repair of power generating apparatus; installation, maintenance and repair of surgical apparatus and instruments; installation, maintenance and repair of sorting machines; installation, maintenance and repair of electronic control apparatus; installation, maintenance and repair of apparatus for processing metals; installation, maintenance and repair of electronic regulating apparatus; installation, maintenance and repair of electrical and electronic apparatus and equipment; installation, maintenance and repair of equipment and apparatus for use in road building; repair and maintenance of electrical apparatus; installation, repair and maintenance of measuring, signalling and monitoring apparatus and instruments; installation, maintenance and repair of equipment and apparatus for use in demolition; installation, maintenance and repair of manufacturing machines and apparatus; installation, maintenance and repair of apparatus for conveying goods; repair and maintenance of machines, apparatus and tools; installation and maintenance of traffic control apparatus; maintenance and repair of machines, apparatus and tools; installation, maintenance and repair of weighing apparatus; installation and repair of telecommunication apparatus; maintenance and repair of surgical instruments and apparatus; installation, maintenance and repair of electronic data processing apparatus; repair and maintenance of medical apparatus; installation, maintenance and repair of telecommunications apparatus and instruments; installation, maintenance and repair of quality control apparatus; installation, repair or maintenance of measuring and testing machines and instruments; installation, maintenance and repair of regulating, monitoring and control apparatus; installation, maintenance and repair of electronic monitoring apparatus; installation, maintenance and repair of machinery; installation, maintenance and repair of measuring, signaling and monitoring apparatus and instruments; maintenance and repair of electronic apparatus; repair or maintenance of loading-unloading machines and apparatus

calibration of machines; calibration [measuring]; calibration of medical apparatus; calibration of measuring apparatus; calibration of instruments; calibration of analytical apparatus; calibration of electronic equipment; calibration of testing equipment; calibration of electronic apparatus; calibration of laboratory apparatus; calibration of laboratory equipment; calibration of measuring instruments; calibration [measuring] services; calibration of construction testing equipment