Optical communication equipment, namely, optical transmitters, optical receivers; electric test and calibration devices for calibrating and testing ammeters and galvanometers; ammeters; surveying apparatus and instruments; automation system for power plants comprised of ammeters, voltage meters, non-contact voltage testers, multimeters, intelligent motor protector in the nature of voltage surge protectors, harmonic analyzers and insulation resistance testers, network communication and backend monitoring application system comprised of leakage current tester; electric installations for the remote control of industrial operations; electro-dynamic apparatus for the remote control of railway points; electric apparatus for commutation, namely, rectifier transformers and rectifiers; explosion-proof high-voltage electrical power distribution units; electric theft prevention installations in the nature of electric anti-theft alarms, other than for vehicles; sound alarms; batteries, electric