听力防护器 meaning in Chinese

ear protector
hearing protector

Hearing protectors - safety requirements and testing - part 7 : level - dependent ear - plugs ; german version en 352 - 7 : 2002
听力防护器.安全要求和检测.第7部分:电平相关耳塞
Hearing protectors - safety requirements and testing - part 6 : ear - muffs with electrical audio input ; german version en 352 - 6 : 2002
听力防护器.安全要求和检测.第6部分:带电子音频输入
Hearing protectors - safety requirements and testing - part 5 : active noise reduction ear - muffs ; german version en 352 - 5 : 2002 a1 : 2005
听力防护器.安全要求和检测.第5部分:有源降噪耳机护套