Surveying instruments; Smoke detectors; Sound alarms; Electronic devices for measuring electric current; Air analysis apparatus; Alarms for the detection of inflammable gases; Thermo-hygrometers; Alcoholmeters; Piezoelectric sensors; Laser pointers

'air':13 'alarm':6,16 'alcoholmet':26 'analysi':14 'apparatus':15 'current':12 'detect':19 'detector':4 'devic':8 'electr':11 'electron':7 'gase':22 'hygromet':25 'inflamm':21 'instrument':2 'laser':29 'measur':10 'piezoelectr':27 'pointer':30 'sensor':28 'smoke':3 'sound':5 'survey':1 'thermo':24 'thermo-hygromet':23

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