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ISO 389-9:2009
M00001251
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ISO 389-9:2009 Acoustics - Reference zero for the calibration of audiometric equipment - Part 9: Preferred test conditions for the determination of reference hearing threshold levels
standard by International Organization for Standardization, 05/01/2009
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ISO 389-9:2009 specifies test conditions for determining the hearing thresholds of subjects for the purpose of establishing standardized values for reference hearing threshold levels.