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並前往https://www.dmr.gov.za/Portals/0/Resource%20Center/Guidelines%20for%20the%20Mandatory%20Codes%20of%20Practice/DMR%2016323%20Occupational%20Medicine/Standard%20threshold%20shift%20NIHL_GG%2040142_No%20R%20839.pdf?ver=2018-03-13-014551-673

Mine Health and Safety Act: Regulations

or more at the frequencies of 2000Hz. 3000Hz and 4000 Hz in one or both ears, as compared to the employee's milestone baseline audiogram. 5 ...

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