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AUTOMATIC FLUID-COMPOSITION CONTROL MACHINES AND INSTRUMENTS; AUTOMATIC LIQUID-FLOW CONTROL MACHINES AND INSTRUMENTS; AUTOMATIC LIQUID-LEVEL CONTROL MACHINES AND INSTRUMENTS; CONTROL VALVES FOR REGULATING THE FLOW OF GASES AND LIQUIDS; DIFFERENTIAL SWITCHES; ELECTRIC CONTROL PANELS; ELECTRIC SENSORS; ELECTRIC SWITCHES; ELECTRONIC CONTROLS FOR MOTORS; ELECTRONIC DETECTORS FOR OBSERVING AND MEASURING THE INFRARED SPECTRUM, NAMELY, INFRARED DETECTORS; ELECTRONIC SPEED CONTROLLERS; ELECTRONIC TIMERS; FILLING LEVEL DETECTORS; FLOW SWITCHES FOR MONITORING AND CONTROLLING THE FLOW OF GASES OR LIQUIDS; LEVEL GAUGES; LEVEL INDICATORS; LEVEL MEASURING MACHINES FOR SURVEYING; LEVEL SWITCHES AND LEVEL INDICATORS FOR MONITORING AND CONTROLLING LIQUIDS IN TANKS AND VESSELS; LIQUID LEVEL SENSORS; MECHANICAL REMOTE CONTROLS FOR MOTORS; MICROSENSORS FOR MEASUREMENT OF PRESSURE, ACCELERATION, FORCE AND FLOW, NAMELY, SILICON PIEZORESISTIVE PRESSURE SENSORS; OIL LEVEL SENSORS; PHOTOELECTRIC SENSORS; POWER SWITCHES; PRESSURE CONTROLLERS FOR CONTROLLING THE PRESSURE OF LIQUID, SEMI-LIQUID, AND GASEOUS SUBSTANCES IN INDUSTRIAL PROCESSES; PRESSURE SWITCHES AND SENSORS FOR MONITORING, CONTROLLING, AND SWITCHING HYDRAULIC OR PNEUMATIC SYSTEMS; REMOTE FUEL OIL LEVEL SENSING SYSTEM; ULTRASONIC SENSORS; WATER LEVEL INDICATORS