- octagon kelly
- 八角形: octagon; octangle; octagonal
- 方: square
- 钻杆: bull rod; bar; rod; drill st ...
- 方钻杆: grief joint; grief kelly; grief stem; keklly vara cuadrante; kelly bar; kelly joint; kelly rod; kelly stem; kelly vara cuadrante de perforacion; square drill rod; square kelly; square shaft
- 八角形: eight-square; octagon
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