ELECTRIC MEASURING, CALCULATING, CONTROLLING, AND REGULATING APPARATUS, EQUIPMENT AND INSTRUMENTS FOR THE SUPPLY AND DISTRIBUTION OF ELECTRICAL ENERGY, NAMELY, ELECTRIC MEASURING INSTRUMENTS FOR MEASURING TEMPERATURE, CURRENT, AND VOLTAGE OF TRANSFORMERS, ELECTRICAL CONTROLLERS, VOLTAGE REGULATORS, AND MONITORING DEVICES FOR MONITORING TEMPERATURE, CURRENT, VOLTAGE, AND COOLING OF ELECTRIC SWITCHES AND TRANSFORMERS