NQ HQ PQ Drill Tube / Drill Pipe Casing , Mannesmann Salzgitter steel Wireline Core Barrel Drill Pipe Casing Tube HWT For Coal Mineral Exploration cor...
Sumitomo metal / British steel Cold Rolled Drill Pipe Casing High Precision WT Casing WT Pipe Casing WT Series Casing WT Series Pipe Casing DCDMA-BS c...