<![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389:1975/Add 1:1983]]> /cms/render/live/es/sites/isoorg/contents/data/standard/00/43/4376.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± 389:1975/Add 1:1983]]> <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 389:1975/Add 1:1983 - Acoustics — Reference zero for the calibration of audiometric equipment — Addendum 1]]> /cms/render/live/es/sites/isoorg/contents/data/standard/00/43/4376.html /cms/render/live/es/sites/isoorg/contents/data/standard/00/43/4376.html 1991-03-01