GUANNAN has a team of engineers :
Two advisers in Tsinghua University .
One engineering director .
Four ordinary engineers doing testing,fitting,drawing and moulding.
For the mining items:
1,Molten steel should be pure.
2,The equipments shoub be Automatic.
3,The items should be high impact and extremely cold weather.
4,Material and Sharp design are both important.
5,Flow detection is needfull.