Electrical and electronic diagnostic systems consisting primarily of microprocessor based hardware and software used to monitor the reliability of a vehicle's operation and a vehicle's operation and maintenance costs; electric and electronic overvoltage and current protection guard systems consisting primarily of sensors, display units, signal processors, communication and memory modules, and circuit breakers used to protect electric devices from damage caused by power surges; information and control units for monitoring electricity consumption and promoting lower energy consumption; electrical and electronic self-test systems consisting primarily of sensors, display units, signal processors, memory and communication modules used to diagnose problems with vehicles for easier and quicker maintenance; electrical and electronic insulating guard systems consisting primarily of sensors, display units, signal processors, communication modules, and circuit breakers used to monitor the state of the insulation of electrically conductive parts of a vehicle; electrical and electronic anti-wheel skid and slide control systems consisting primarily of sensors, display units, signal processors, memory and communication modules used to prevent skidding and sliding of wheels in the event of sudden braking or braking on a slippery surface, all the preceding for public transport vehicles, namely, streetcars, trolleybuses, and buses; battery and battery chargers for land and subway vehicles excluding automobiles

Public transport vehicles, namely, streetcars