Sensors and detectors, In particular active infra-red sensors, Detection apparatus, Detectors for electric meters, Electric sensors, Electro-optical sensors, Electronic sensors, Optical fibre sensors, Photoionic detectors, Infrared detection apparatus, Infrared scanners, Infrared sensors, Laser detectors, Light sensors, Magnetic sensors, Measuring sensors, Optical sensors, Passive infrared detectors, Photoelectric sensors, Piezoelectric sensors, Pyroelectric infrared sensors
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