2013 a steel ball sorter

2013 an auxiliary device for steel ball heat treatment

2013 an auxiliary transportation device for steel ball casting production line

2013 an auxiliary packing device for steel ball casting production line

2013 a skeleton reinforced wear-resistant steel ball

2013 a nano material reinforced wear-resistant steel ball

2013 a wear-resistant steel ball quenching auxiliary device

2013 auxiliary device of wear-resistant steel ball quenching furnace