Gas sensors; Electronic apparatus used for detection and analysis of toxic or explosive gas as well as chemical pollutants in the atmosphere and for automatic control of air ventilation systems; Gas sensors being equipped with sound and visual alarms

'air':28 'alarm':39 'analysi':9 'apparatus':4 'atmospher':22 'automat':25 'chemic':18 'control':26 'detect':7 'electron':3 'equip':34 'explos':13 'gas':1,14,31 'pollut':19 'sensor':2,32 'sound':36 'system':30 'toxic':11 'use':5 'ventil':29 'visual':38 'well':16

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