Non-metal thresholds

Acoustic sound alarms; Circuit breakers; Connection cables; Electric cables, wires, conductors and connection fittings therefor; Electric junction boxes; Electric sockets; Electrical and electronic connectors; Electronic components, namely, piezoelectric switches; Electronic integrated circuits; Indicator lights for telecommunication apparatus; Integrated circuit modules; Laboratory equipment and supplies, namely, incubators; Light emitting diodes (LEDs); Light switches; Power distributing boxes

Identity plates of common metal; Placards of metal