Alarm sensors; Apparatus and instruments for conveying, distributing, transforming, storing, regulating or controlling electric current; Cables, electric; Converters for electric plugs; Electric plugs; Electric sensors; Electric wires and cables; Electrical and electronic burglar alarms; Gas testing instruments; Junction sleeves for electric cables; Pressure indicator plugs for valves; Protective sheaths for fiber optical cables; Resistance measuring instruments; Voltage stabilizing power sup...