9 [ Electrical and electronic apparatus and equipment namely, oil level sensors, optical sensors, electric sensors; electrical filters, namely, optical filters, laboratory filters; switches, namely, electric switches, electric circuit switches; current and voltage limiting devices, namely, current transformers, current rectifiers; drives, namely, CD-ROM drives, external computer hard drives; electronic and electric cables; monitoring devices, namely, battery monitors, electronic monitors and monitor modules for monitoring electric current and electrical signals; electric relays, namely, earth leakage protection relays; control modules, namely, electrical controllers; transformers, namely, electric transformers; detection devices and control systems, namely, heat detection systems comprised of fiber optic linear loop configurations, heat detectors, monitors; electric controllers, namely, programmable controllers; earth leakage protection devices, namely, electronic core balance relays, current transformers, circuit breakers; earth leakage protection devices with variable speed drives, namely, electronic core balance relays, current transformers, circuit breakers; earth fault current limitation devices and systems, namely, electronic core balance relays, current transformers, circuit breakers; earth continuity monitoring and protection devices and systems, namely, electronic core balance relays, current transformers, circuit breakers; earth fault lockout protection devices and systems, namely, electronic core balance relays, current transformers, circuit breakers; variable speed drives, namely, electronic controls for use with variable speed drives; devices and systems for earth leakage protection with variable speed drives, namely, electronic core balance relays, current transformers, circuit breakers; ] gas analysis instruments, namely, gas testing instruments, gasometers; monitors, namely, flow switches for monitoring and controlling the flow of gases; alarms, namely, gas alarms, alarm monitoring systems; indicators, namely, level indicators, temperature indicators; transmitters, namely, radio transmitters, telephone transmitters; sensors, namely, toxic gas sensors; flammable gas sensors; control and display devices, namely, electric controllers, computer monitors ; gas sensing systems including systems for monitoring Oxygen Hydrogen Sulphide, and Carbon Monoxide comprising gas sensors, computer monitors ; catalytic methane gas sensors and transmitters; displays, namely, LED displays; [ calibration installations and instruments for calibrating ultrasonic testers, optical emission spectrometers; communication systems comprising computers, communication hubs; voltage and current regulators; devices, namely, electric relays and electric controllers for protection of underground mining equipment; ] equipment for data transmission parts and fittings along with all accessories for all the aforesaid goods, namely, radio transmitters