Abstract
Specifies the frequency for the note A in the treble stave and shall be 440 Hz. Tuning and retuning shall be effected by instruments producing it within an accuracy of 0,5 Hz.
General information
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Status: PublishedPublication date: 1975-01Stage: International Standard confirmed [90.93]
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Edition: 1Number of pages: 1
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Technical Committee :Ïã¸ÛÁùºÏ²Ê¿ª½±/TC 43ICS :17.140.01
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