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Common metals and their alloys; non-electric cables and wires of common metal; safes; roof coverings of metal; metal roof vents; metal dormer vents; beams of metal; nuts, bolts and fasteners of metal; screw nuts of metal; joists of metal; flanges of metal (collars); belt stretchers of metal; cramps of metal; bindings of metal; screws of metal; rivets of metal; construction articles of metal in the field of photovoltaics and electrical installations, namely, metal cable clamps, construction elements of metal, structural joint connectors of metal, metal fasteners, steel rods, cable trays, cable ladders, mesh cable trays; metal sheets and foils with coatings for reflection or absorption of light and thermal radiation. Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; lightning conductors; lightning arresters; lightning arrester equipment; surge protection devices; parts and accessories for surge protection devices included in this class; surge protection devices for computer networks; surge protection devices for video cameras and video signal concentrators; surge arresters; voltage surge protectors; circuit breakers; varistors; spark gaps; choking coils (impedance); diodes; electric converters; compact discs; DVDs and other digital recording media; photovoltaic installations for generating electricity (photovoltaic power plants); photovoltaic modules; polycrystalline photovoltaic modules; monocrystalline photovoltaic modules; photovoltaic cells; solar electric systems; solar collectors for electricity generation; electricity generating apparatus utilizing solar power; solar cells, especially cells for conversion of solar energy into other energy forms; solar roofs for generating electricity; electric and electronic units for monitoring and protection of solar collectors and related components and apparatus; solar batteries; solar collectors for electricity generation and apparatus in combination with solar cells for solar electricity generation belonging to this class; photovoltaic solar power plants belonging to this class; components for solar power plants belonging to this class; metal ducts (electric); electric cable channels; electronic publications with manuals and instructions relating to electric apparatus, use of energy, energy management and advice for consumers with respect to efficient use of energy and renewable sources of energy; electronic publications, downloadable. Installation, maintenance and repair of lightning protection installations and surge protection devices; construction, installation, repair and maintenance of solar power plants; installation, repair and maintenance of grid-connected photovoltaic systems; installation, repair and maintenance of stand-alone photovoltaic systems; installation, repair and maintenance of solar and photovoltaic panels and modules; advisory services relating to lightning protection installations and surge protection devices; advisory services relating to the construction of solar power plants.