Electric cables and wires including those in ready-made form; metal wires, uninsulated (bare) or coated, for electrical use; parts and fittings therefor, such as wire-connectors, cable coupling boxes, cable terminals, for electrical use and anti-corrosive agents therefor; metal base-fibres such as pipes made of ferrous and non-ferrous material and alloys, uninsulated or coated, as well as modified; apparatus for the production of cables and wires as well as metal base fibres