allocation factor for oil well and water injector
Asbestos-cement pipe for well casing
perforating bullet for oil well
pipe well for lower water
Steel for Oil Well Tubing
irregular thick-wall tubular billet
paste-filling for tubular positive plate
reduce tubular well water level
tubular well subway dewatering
Billet for Vehicle Axle
Continuously-cast billet for tube-rolling
Round billet for tube－ making