Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; round plug connectors; power connectors; connectors (electricity); electrical connectors; insulated electrical connectors; electronic connectors; plug-in connectors; plug connectors; pin-and-socket connectors; socket connectors; connectors for electronic circuits; coaxial connectors; optical connectors; electric contacts; electric contacts of precious metal; electric wires and cables; light conducting filaments; insulated copper wire; electric wires; identification sheaths for electric wires; clamps (electricity); telecommunication cables; electric cables with mineral insulation; electronic cables; jack cables; optical cables; coaxial cables; cables for electrical signal transmission; cables for electrical or optical signal transmission; cables for optical signal transmission; radio relay cables; sheaths for electric cables; materials for electricity mains (wires, cables); threaded cable fittings for electrical cables; plug adapters; electric plugs; electrical plugs and sockets; converters for electric plugs; antennas; distribution boxes (electricity); anti-interference devices (electricity); branch boxes (electricity); branch boxes (electricity); video cameras; printed circuit boards; USB flash drives