Hearing protection for industry: types, selection vary with needs.
D004430:Ear Protective Devices; D006801:Humans; D009622:Noise / Q000517:prevention & control*; D009623:Noise, Occupational / Q000009:adverse effects / Q000517:prevention & control*; D011482:Protective Devices; D014481:United States; D014489:United States Occupational Safety and Health Administration