coaxial cables, fibre [fiber (Am.)] optic cables, optical fibers [fibres] [light conducting filaments]/light conducting filaments [optical fibers [fibres]], telegraph wires, telephone wires, Magnets, magnetizers and demagnetizers, electromagnetic coils, magnets, decorative magnets, Devices for treatment using electricity, cathodic anti-corrosion apparatus, electrolysers, ionization apparatus not for the treatment of air or water, ozonisers [ozonators].