19世纪中叶出现了机械传动的带式溜槽和圆形溜槽，成为当时细粒有色金属矿石的主要选别设备。
The mid-19th century, experienced a mechanical transmission belt chute chute and round, becoming one of the major fine-grained non-ferrous metals ore sorting equipment.
19世纪中叶出现了机械传动的带式溜槽和圆形溜槽，成为当时细粒有色金属矿石的主要选别设备。
The mid-19th century, experienced a mechanical transmission belt chute chute and round, becoming one of the major fine-grained non-ferrous metals ore sorting equipment.
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