1、 Iuxta productionem methodorum Classification (1) Inconsutilem Pipe - Hot-rolled Pipes, Frigidus-rolled Fistulae, Frigidi-tractae Tubes, Extrudi Tubuli, Pipe Jacking 2) Iuncta Pipe (A) Secundum Sub-Processus - Arc iuncta Pipe, ERW Pipe (High Frequency, Low Frequency), Gas Pipe, Furn...
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