Electrical switchgear in the nature of voltage and/or current controllers for electric power lines; electric power converters using power semi-conductors for conducting, transporting, distributing, switching, accumulating, regulating, checking or controlling electric power; apparatus, namely, voltage and/or current regulators for electric power used for checking, controlling and regulating electric power converters; supervision and control apparatus, namely, protective electric relays, electr...

Electrical switchgear in the nature of voltage and/or current controllers for electric power lines; electric power converters using power semi-conductors for conducting, transporting, distributing, switching, accumulating, regulating, checking or controlling electric power; apparatus, namely, voltage and/or current regulators for electric power used for checking, controlling and regulating electric power converters; supervision and control apparatus, namely, protective electric relays, electr...