<![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389:1985]]> /cms/render/live/es/sites/isoorg/contents/data/standard/00/43/4374.html Normas y proyectos de Ïã¸ÛÁùºÏ²Ê¿ª½± Ïã¸ÛÁùºÏ²Ê¿ª½±.org 60 /modules/isoorg-template/img/iso/favicon/red/favicon1.ico http://www.iso.org/ <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389:1985]]> <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389:1985 - Acoustics — Standard reference zero for the calibration of pure tone air conduction audiometers]]> /cms/render/live/es/sites/isoorg/contents/data/standard/00/43/4374.html /cms/render/live/es/sites/isoorg/contents/data/standard/00/43/4374.html 1991-03-05