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Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
infrared light emitting diode; light emitting diode (led); phototransistors packaged in optoelectronic packages that can detect light of specified wavelength, namely, photo detectors, optical switches, and optical sensors; photo-sensor that are in optoelectronic packages can detect light of specified wavelength, namely, ambient light detectors, and optical switches; optical cursor control devices, namely, computer mouse, touch panels, touch screens, game controllers for computer games and electronic game controllers incorporated into exercise machines; light emitting diode back-light for display; photo-couplers consist of infrared emitting diode and optically coupled to a phototransistor in the same package, namely, used in ac line monitors and polarity dc sensors; light emitting diode chips