Optical apparatus and instruments; microchip, magnetic and optical cards; optical cables; fiber-optic cables; optical fibers (light conducting filaments); optical multiplexers for combining two or more signals to a composite optical signal; telecommunication transmitters; transmitting sets (telecommunication); transceivers; digital communication network switches; measuring instruments; electric measuring apparatus; power sockets, connectors, adapters and contacts for manufacture of electrical connections or optical fibers
Electrical and Scientific ApparatusInformation relating to telecommunications; communications by fiber-optic networks; communications by radio or telephone; connection by telecommunications to a global computer network; rental of telecommunication apparatus
Telecommunications