... crane, 20t gantry crane, Gantry-type NC planer drilling machine, Automatic numerical control, large hot galvanizing line, Large ... submerged-arc welding center, Straight flange welding machine, NC torch cutting machine, 6-shaft NC tube intersection-cutting line, ... plate production line, Hydraulic NC 3-roll plate bending machine.d)Certificate:Certificate for Qualification of Construction Enteprise, ...