industrial respiratory hoods in the nature of breathing hoods for non-medical purposes for use in contaminated environments to provide clean air to user; powered air purifying respirators, namely, electrical-powered respirators other than for artificial respiration for use in air purification; industrial respiratory welding helmets for use in contaminated environments to provide clean air to the user and protect the head of the user

'air':23,27,43,57 'artifici':38 'breath':8 'clean':22,56 'contamin':18,52 'electr':32 'electrical-pow':31 'environ':19,53 'head':64 'helmet':48 'hood':3,9 'industri':1,45 'medic':13 'name':30 'natur':6 'non':12 'non-med':11 'power':26,33 'protect':62 'provid':21,55 'purif':44 'purifi':28 'purpos':14 'respir':29,34,39 'respiratori':2,46 'use':16,41,50 'user':25,60,67 'weld':47

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