Electric and electronic apparatus for the control, the regulation, the transmission, the reception, the reproduction, the processing and the production of sounds, images, data and information, namely switches, deviators, commutators, electric plugs and sockets, cartridges and wire type fuses, fuse holders, lamp holders for filament and fluorescent lamps, electric bells in general, bells for two or more tones, circuit breakers, isolators, solid state switches, motor starters, remote motor starters, electric panel boards, distribution boards, command and control boards, whether combinable or not, control desks, combinable control desks, ganged terminal blocks, derivation boxes, terminals, pilot and warning lamps, apparatus and boards for signaling and warning, signalization apparatus and boards with guide-lamps and accessories, apparatus for detecting electric current leakage, phase test apparatus, thermostats, sunset switches, level signalers, pressure signalers and limit switches, relays, timers and timer switches, electronic flashes, dimmers, earth leakage circuit breakers, electric transformers, remote control switches, telecommunication apparatus with or without amplification, relay panels or boards, principal and auxiliary posts and shunts for voice transmissions, electric door speakers, telephones, entrance directories for buildings, namely, luminous signs, illuminated exit signs; radio sets for locating personnel, loud speaker installations, television door speakers; videophones, closed-circuit television sets for civil and industrial use, microswitches, limit switches; electric conductors and cables; fiber-optic cables