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Apparatus, instruments and cables for electricity; photovoltaic apparatus and installations for generating solar electricity; solar panels for the production of electricity; solar cells for electricity generation; inverters, especially photovoltaic inverters; current rectifiers; voltage converters; intelligent gateways for real-time data analysis; surveying, electrical, optical, weighing, measuring, signaling, control, regulation, monitoring apparatus for photovoltaic installations; surveying, electrical, optical, weighing, measuring, signaling, control, regulation, monitoring instruments for photovoltaic installations; surveying, electrical, optical, weighing, measuring, signaling, control, regulation, monitoring sensors for photovoltaic installations; data processing equipment and computers for photovoltaic installations; photovoltaic cells, modules, assemblies and installations; electronic control and regulating apparatus for solar power installations (included in this class); software and control programs for controlling, regulating and monitoring solar power installations.Building and construction materials and elements, not of metal; facades for buildings, not of metal; facade elements, not of metal, in particular including photovoltaic modules.Building construction advisory services; installation, cleaning, repair and maintenance of building facades; installation of solar powered systems; installation and maintenance of photovoltaic installations; maintenance, repair and reconditioning of photovoltaic apparatus and installations.