Underground mining machines - mobile extracting machines at the face - safety requirements for shearer loaders and plough systems 地下采矿机械.工作面上的移动式采掘机械.截装机和开沟机系统的安全要求
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Underground mining machines - mobile extracting machines at the face - safety requirements for shearer loaders and plough systems 地下采矿机械.工作面上的移动式采掘机械.截装机和开沟系统的安全性要求
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Underground mining machines - mobile extracting machines at the face - safety requirements for shearer loaders and plough systems ; german version en 1552 : 2003 地下采矿机械.工作面上的移动式采掘机械.割剪机装