telecommunication wiring; construction, repair, maintenance and installation services; machine installation services; installation, maintenance and repair of computer hardware for telecommunications systems; installing of telecommunications networks; telephone line installation; communications infrastructure construction; installation services of radio telephone equipment; installation of telephone equipment; installation, maintenance and repair of telephones; pipe installation services; installation services of telephone lines; advisory services relating to the installation of telephone equipment; repair of security systems; telephone installation; installation and maintenance services; installation of telephones; repair, maintenance and installation services; installation services of telephones; installation of communications network instruments; installation services of radio telephone apparatus; advisory services relating to the installation of communication equipment; installation of security and safety equipment; installation of communication equipment; installation of telecommunications apparatus; lift installation services; installation services; installation of security systems; installation and repair of telecommunication apparatus; installation and repair of telephones; roofing installation services; installation, maintenance and repair of telecommunications apparatus and instruments; installation and repair services; communications network apparatus installation; cable laying services; roof installation services; installation, maintenance and repair of telecommunications equipment; consultancy services regarding the installation and maintenance of telecommunications, transmission and broadcasting equipment, apparatus and instruments; installation of telephone lines; lift and passenger lift installation services; installation of telecommunications networks; installation services relating to the modernization of machines, machine tools and automatic systems for treating and processing metals; telephone installation and repair; installation, repair and maintenance services; installation, maintenance and repair of telephone and communication equipment; installation of telephone cables; wiring services for telecommunications; pipeline installation services; security system installation; telecommunication wiring services; installation, maintenance and repair services