Surveying apparatus and instruments; Connection cables; Electric junction boxes; Switches, electric; Couplings, electric; Relays, electric; Thermostats; Voltage surge protectors; Low-voltage power supplies; Electrical plugs and sockets; Power switches; Electromagnetic locks; Electrical terminal blocks; Electrical terminal boxes; Electronic components in the nature of capacitors, connectors, filters, oscillators, relays, switches, transformers, resistors, semiconductors, integrated circuits, r...