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Installation material for the assembly of lightning conductors and earthing, in particular safety devices, cable bushings for roofs, conductor holders, holders for lightning conductors, bindings for lightning conductors, terminals, in particular connection and junction terminals, disconnect terminals, testing terminals, earth stake, collars, in particular earthing collars, screws, connectors, covering plates, covering lids, ladders, ladder rungs and metal crowns for chimneys, in particular for factory chimneys. Ground clamps, mounting tools for lightning conductors and earthing installations, wire straightening apparatus, driving equipment for driving in deep grounding plates (excluding machine-driven equipment); safety pliers. Lightning conductors, conductors and equipment for earthing conductors and lightning conductors, electric switches, circuit- breaker fittings, grounding plates for foundations and potential compensation, sectional grounding rods, deep grounding plates, grounding rods and tubes, overvoltage protection apparatus, spark gaps, overload current meters, earthing measuring instruments and their housings, safety equipment for working on electrical installations, in particular fuse clips, earthing and short-circuiting devices for indoor and outdoor installations, earthing devices for railways, earth rods, earthing and short-circuiting devices for low voltage lines and cable distributors for low-voltage and for cranes, current collection devices, discharge poles, voltage testers. Electrical installation, installation and assembly of lightning conductors and earthing, repair and maintenance of products in the electrotechnical field.