respirators other than for artificial respiration, filters for respiratory masks and hoods used for protection in polluted or hazardous environments, and safety equipment, namely, self-rescue apparatus, namely, oxygen breathing units and compressed air breathing units and respiratory filters for breathing protection in polluted or hazardous environments

'air':35 'apparatus':28 'artifici':5 'breath':31,36,42 'compress':34 'environ':20,48 'equip':23 'filter':7,40 'hazard':19,47 'hood':12 'mask':10 'name':24,29 'oxygen':30 'pollut':17,45 'protect':15,43 'rescu':27 'respir':1,6 'respiratori':9,39 'safeti':22 'self':26 'self-rescu':25 'unit':32,37 'use':13

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