| 标准编号 | IEC 60118-4:1981 |
| 标准名称 | Methods of measurement of electro-acoustical characteristis of hearing aids. Part 4: Magnetic field strength in audio-frequency induction loops for hearing aid purposes |
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| 标准编号 | IEC 60118-4:1981 |
| 标准名称 | Methods of measurement of electro-acoustical characteristis of hearing aids. Part 4: Magnetic field strength in audio-frequency induction loops for hearing aid purposes |
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| 标准状态 | |
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| 无 |
