Vol. 14 No. 23 (1999): Acústica e Vibrações 23

Summary content:

• Diagnoses of HLIB (Hearing Loss Induced by Occupational Noise) by the new NR-7 (Ordinance 19 Mtb. of 09/04/98);
• Comparing bananas with oranges;
• Hearing protectors: A new NRRsf; and
• A practical case: Silencer for Roots.