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Installation material for making electric connections, in particular connection components for data and telecommunications networks, electric connectors, plugs, bases, bushings, terminals, adapters, couplings, connection boxes, sockets, distribution boxes, distribution panels, patch panels, distribution cables, patch cables, cables, cable sets, pre-installed connection conduits; the aforesaid goods for electric and electronic apparatus for data, telecommunications, control, regulating or automation systems; installation material for making optical connections, in particular connection components for data and telecommunications networks, optical fibres, fibre-optic cables, optical fibre cords, connectors, plugs, bases, bushings, terminals, adapters, couplings, connection boxes, sockets, distribution boxes, distribution panels, patch panels, distribution cables, patch cables, cables, fibre-optic cable sets, pre-installed fibre-optic connection conduits; the aforesaid goods for electric and electronic apparatus for data, telecommunications, control, regulating or automation systems; installation components for electric or electronic apparatus, in particular protective housings, protective housings with integrated electric and/or optical distributors and protective housings with integrated electronic circuits; testing and measuring apparatus, in particular for electric networks, for optical networks, for data transmission and for telecommunications; electric and electronic supply apparatus, in particular power supply modules; hardware for constructing data and telecommunications networks, in particular repeaters, gateways, input and output apparatus, bus and sensor systems; protective and switching equipment, in particular fuses, overvoltage protection modules, switches, switching apparatus, relays; electric, electronic and optical components and systems for managing connections on distribution panels or patch panels