self contained compressed air breathing apparatus designed for respiratory protection in hazardous atmospheres for use by firefighters, miners, industrial workers, safety workers, chemical workers, and other safety personnel; respirators for use with a supplied atmosphere not for artificial respiration

'air':4 'apparatus':6 'artifici':38 'atmospher':13,35 'breath':5 'chemic':23 'compress':3 'contain':2 'design':7 'firefight':17 'hazard':12 'industri':19 'miner':18 'personnel':28 'protect':10 'respir':29,39 'respiratori':9 'safeti':21,27 'self':1 'suppli':34 'use':15,31 'worker':20,22,24

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