[Studies on respiratory protective devices. VIII. Optimum flow rate of the hose mask].
D006801:Humans; D008397:Masks; D009787:Occupational Medicine; D011009:Pneumoconiosis / Q000517:prevention & control*; D011482:Protective Devices; D012134:Respiratory Protective Devices
INDUSTRIAL MEDICINE; MASKS; PNEUMOCONIOSIS/prevention and control