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Cables, electric conductors, parts and fittings thereof; couplings, electric, parts and fittings thereof; cables and conductors for telecommunications, and parts and fittings thereof; optical fibres; optical fibre cables and parts and fittings thereof; telecommunications lines and systems, parts and fittings thereof; optical telecommunications lines and systems and parts and fittings thereof; optical telecommunications lines and systems with wavelength multiplication and parts and fittings thereof; video, voice and data transmission lines and systems and parts and fittings thereof; lines and systems for the distribution of interactive services and parts and fittings thereof; optoelectronic systems and parts and fittings thereof; passive optical line systems and parts and fittings thereof; optical apparatus and instruments and parts and fittings thereof; devices for the generation, commutation, combination, amplification, regeneration, transmission and reception of optical signals, parts and fittings thereof; devices for cable television, parts and fittings thereof; planar optical devices and parts and fittings thereof; lasers and parts and fittings thereof; optical amplifiers and parts and fittings thereof; optical modulators and parts and fittings thereof