9 ELECTRICAL AND ELECTRONIC COMPONENTS, NAMELY- SWITCHES, INDICATOR LIGHTS, LINE BUSHINGS, CABLE ENTRIES, RELAYS, RESISTORS, CAPACITORS, CABLES, CONDUITS, DISTRIBUTORS, CONNECTORS, TERMINALS, PHOTO-ELECTRIC PAIRS, FUSES, ZENER BARRIERS AND LEAKAGE BREAKERS; ELECTRICAL INSTALLATION MATERIAL AND FITTINGS, NAMELY - CONNECTION TUBES, END PIECES, AND TERMINAL, CONNECTION AND JUNCTION BOXES; ELECTRICAL AND ELECTRONIC AS WELL AS OPTICAL, ACOUSTIC AND ENVIRONMENTALLY PROTECTED, AND EXPLOSION PROOF, SENSING, MEASURING, SIGNALLING, CONTROL AND REGULATING APPARATUS, COMPONENTS AND STRUCTURAL PARTS THEREFOR, NAMELY - AMPLIFIERS, POTENTIOMETERS, THERMOSTATS, ACCUMULATORS, POWER SUPPLY MODULES, FEED-IN AND MONITOR UNITS, MULTIMETERS, PUSH BUTTON STATIONS, COUNTERS, ANALYZERS, TEMPERATURE AND ENERGY CONTROLLERS, LIMITERS AND REGULATORS, INDICATORS, DETECTORS, TRANSDUCERS, TRANSFORMERS, CONVERTERS FOR MEASURED SIGNALS AND VALUES (LIGHT, FREQUENCY, VOLTAGE), SAFETY BARRIERS, LEAKAGE SENSORS AND BARRIERS, METERING AND INJECTION APPARATUS