<![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 266:1997]]> /cms/render/live/en/sites/isoorg/contents/data/standard/00/13/1350.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± 266:1997]]> <![CDATA[Ïã¸ÛÁùºÏ²Ê¿ª½± 266:1997 - Acoustics — Preferred frequencies]]> /cms/render/live/en/sites/isoorg/contents/data/standard/00/13/1350.html /cms/render/live/en/sites/isoorg/contents/data/standard/00/13/1350.html 2023-12-07