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ISO 16:1975
M00000434
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ISO 16:1975 Acoustics - Standard tuning frequency (Standard musical pitch)
standard by International Organization for Standardization, 01/01/1975
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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.