Cables, electrical conductors, their parts and accessories; electrical joints, their parts and accessories; telecommunication cables and conductors, their parts and accessories; optical fibres; optical fibre cables, their parts and accessories; wavelength division multiplexing optical telecommunication systems and lines, their parts and accessories; video, voice and data transmission systems and lines, their parts and accessories; systems and lines for interactive services distribution, their parts and accessories; opto-electronic systems, their parts and accessories; passive optical systems and lines, their parts and accessories; devices for generation, reception, transmission, regeneration, amplification, combination, switching, of optical signals, their parts and accessories; lasers, their parts and accessories; optical amplifiers, their parts and accessories; optical modulators, their parts and accessories