ANALOG AND DIGITAL INDICATOR DEVICES, NAMELY, INDICATORS OF OPERATING POSITIONS AND OPERATING STATES OF ELECTRICAL POWER SUPPLY NETWORKS; LIGHT EMITTING DIODES (LEDs) FOR THE INDICATION OF OPERATING POSITIONS AND OPERATING STATES OF ELECTRICAL POWER SUPPLY NETWORKS; REGULATING TRANSFORMERS; ON-LOAD TAP-CHANGERS AND OFF-CIRCUIT TAP-CHANGERS FOR SECURING AND IMPROVING THE QUALITY OF PUBLIC AND INDUSTRIAL POWER SUPPLY SYSTEMS AND FOR INFLUENCING AND COMPENSATING SUPPLY; ELECTRICAL CONTROLLERS FO...