[Individual hearing protection--survey of Berlin's noisy factories].
D001604:Berlin; D006317:Hearing Loss, Noise-Induced / Q000517:prevention & control*; D006801:Humans; D009622:Noise; D009784:Occupational Diseases / Q000517:prevention & control*; D011482:Protective Devices / Q000592:standards*
Individueller Gehörschutz--Erhebung in Berliner Lärmbetrieben.