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[ liquid chemical sensors, monitors, indicators and controllers; and liquid pressure sensors, monitors, indicators and controllers ] * ELECTRICAL MEASUREMENT APPARATUS AND INSTRUMENTS FOR SENSING, MONITORING, INDICATING AND CONTROLLING LIQUID CHARACTERISTICS IN TANKS AND PIPES; NAMELY, LIQUID LEVEL SENSORS, MONITORS, INDICATORS AND CONTROLLERS; LIQUID FLOW RATE SENSORS, MONITORS, INDICATORS AND CONTROLLERS; LIQUID TEMPERATURE SENSORS, MONITORS, INDICATORS AND CONTROLLERS *