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Sensors for determining position; Electric sensors; Mechanical sensors; Electrical detectors; Mechanical detectors; Sensors for determining velocity; Sensors for measuring depth; Ultrasonic sensors; Optical fibre sensors; Sensors for measuring speed; On-off sensors; Electro-optical sensors; Optical sensors, in particular connectable to a communications network; Piezoelectric sensors; Remote control apparatus for opening and closing doors; Window and door opening sensors; Sockets, in particular transportable; Humidity sensors; Hygrometers; Temperature sensors, in particular for measuring air quality; Sockets that can be activated and deactivated, in particular by means of a smartphone; Pressure sensors; Temperature feedback units; Temperature indicators; Temperature control apparatus [thermostats]; Instruments for temperature control; Heat regulating apparatus; Cameras [photography]; Motion-activated cameras; Smoke alarms; Alarm signalling transmitters; Alarm sensors; Alarm signalling receivers; Sound alarms; Alarm systems; Motion sensors; Flowmeters; Surveillance cameras; Video cameras adapted for monitoring purposes; Monitoring instruments; plant sensors; Radar sensors; Portable sensors for measuring body parameters; Portable sensors for measuring vital parameters; Portable sensors for measuring body condition functions