toxic and dust monitoring instruments; namely, proprietary electro-chemical sensing cells, connected to an electronic circuit to provide real time digital concentration levels of, and visual and audible signals as to, the presence of hazardous gases

'audibl':29 'cell':12 'chemic':10 'circuit':17 'concentr':23 'connect':13 'digit':22 'dust':3 'electro':9 'electro-chem':8 'electron':16 'gase':37 'hazard':36 'instrument':5 'level':24 'monitor':4 'name':6 'presenc':34 'proprietari':7 'provid':19 'real':20 'sens':11 'signal':30 'time':21 'toxic':1 'visual':27

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