left-hand screw drill pipe

基本解释左螺旋钻杆

网络释义

1)left-hand screw drill pipe,左螺旋钻杆2)left-handed screw bar,左旋螺杆3)left-hand tool joint thread,左旋钻杆接头螺纹4)screw drilling rod,螺旋钻杆5)left-hand drill pipe,左螺纹钻杆6)left spiral bolt,左螺旋锚杆

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