Cables, electrical conductors, their parts and accessories; electrical connectors, their parts and accessories; cables and conductors for telecommunication, their parts and accessories; optical fibres; optical-fibre cables, their parts and accessories; telecommunication lines and systems, their parts and accessories; optical-fibre telecommunication lines and systems, their parts and accessories; wavelength multiplexing telecommunication lines and systems, their parts and accessories; systems and lines of transmission for video, voice and data, their parts and accessories; systems and lines of distribution of interactive services, their parts and accessories; opto-electronic systems, their parts and accessories; passive optical-fibre systems and lines, their parts and accessories; optical apparatus and instruments, their parts and accessories; devices for generating, switching, combining, amplifying, reprocessing, transmitting and receiving optical signals, their parts and accessories; cable-television devices, their parts and accessories; planar optical devices, their parts and accessories; lasers, their parts and accessories; optical amplifiers, their parts and accessories; optical modulators, their parts and accessories