Field testing of throw-away half-mask dust respirators.
D003032:Coal Mining; D003258:Consumer Behavior; D004209:Disposable Equipment; D004391:Dust; D005069:Evaluation Studies as Topic; D006801:Humans; D008297:Male; D008397:Masks / Q000592:standards*; D008404:Massachusetts; D011009:Pneumoconiosis / Q000517:prevention & control; D012122:Ventilators, Mechanical / Q000592:standards*
D004391:Dust