Provisional head and torso simulator for acoustic measurements on air conduction hearing aids 空气传导助听器声学测量用临时头戴筒式模拟器
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Provisional head and torso simulator for acoustic measurements on air conduction hearing aids ; identical with iec 60959 : 1990 空气传导助听器声学测量用临时头部模拟器和躯干模拟