Self-rescue apparatus, namely, cylinders containing breathable gas mixtures, also known as oxygen breathing units; respirators and respiratory masks for non-medical purposes; non-medical respirators for filtering air; masks for use with non-medical breathing and air filtering apparatus; masks for use during breathing polluted air

'air':32,42,51 'also':11 'apparatus':4,44 'breath':15,40,49 'breathabl':8 'contain':7 'cylind':6 'filter':31,43 'gas':9 'known':12 'mask':20,33,45 'medic':24,28,39 'mixtur':10 'name':5 'non':23,27,38 'non-med':22,26,37 'oxygen':14 'pollut':50 'purpos':25 'rescu':3 'respir':17,29 'respiratori':19 'self':2 'self-rescu':1 'unit':16 'use':35,47

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