<![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 1999:1975]]> /cms/render/live/en/sites/isoorg/contents/data/standard/00/67/6758.html Ïã¸ÛÁùºÏ²Ê¿ª½± standards and projects Ïã¸ÛÁùºÏ²Ê¿ª½±.org 60 /modules/isoorg-template/img/iso/favicon/red/favicon1.ico http://www.iso.org/ <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 1999:1975]]> <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 1999:1975 - Acoustics — Assessment of occupational noise exposure for hearing conservation purposes]]> /cms/render/live/en/sites/isoorg/contents/data/standard/00/67/6758.html /cms/render/live/en/sites/isoorg/contents/data/standard/00/67/6758.html 1990-01-01