Electroacoustics - Hearing aids - Part 9: Methods of measurement of the performance characteristics of bone conduction hearing aids (IEC 60118-9:2019); German version EN IEC 60118-9:2019
电声学.助听器.第9部分:骨传导助听器性能特性的测量方法(IEC 60118-9-2019);德国版本EN IEC 60118-9:2019