9 Apparatus and instruments for conveying electric current; apparatus and instruments for regulating electric current; apparatus and instruments for switching electricity, namely, electric switches; apparatus and instruments for accumulating electricity, namely, electric accumulators; apparatus and instruments for transforming electricity, namely, electric transformers; apparatus and instruments for storing electric current; apparatus and instruments for controlling electric current; electric control panels; electrical switch cabinets; electrical controls for hydraulic cylinders, hydraulic valves, and hydraulic power packs; electric control installations, namely, electric installations for the remote control of industrial operations; electric control apparatus for the remote control of industrial operations; electric control valves, namely, amplifying valves and solenoid valves; electronic controllers for the control of industrial operations; switches, electric; radio control apparatus, namely, radio transmitters and receivers for remote controls; remote control apparatus for the remote control of industrial operations; acceleration sensors; coolant-temperature sensors; electric sensors; industrial calibration sensors; liquid level sensors; oil level sensors; optical sensors; photoelectric sensors; pressure sensors; pollutant sensors; proximity sensors; surface acoustic waves sensors; temperature sensors; timing sensors; ultrasonic sensors; sensors for the determination of temperatures, positions and distances; sensors for determining position, velocity, acceleration and temperature; electronic detectors for observing and measuring the infrared spectrum, namely, infrared detectors; electronic ultrasound flaw detectors; filling level detectors; laser speed detectors; leak detectors for hydraulic cylinders, hydraulic valves, and hydraulic power packs; magnetic object detectors; metal detectors; motion detectors, radar detectors; ultrasonic flaw detectors; ultrasound flaw detectors, not for medical purposes; electronic controllers for hydraulic cylinders, hydraulic valves, and hydraulic power packs; thermostats