国产人成精品香港三级在,国产欧美日韩精品第二区,国产欧美成人一区二区三区
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Drilling Rig
Usage
250×250 Kelly bar is the driving drilling pipe special for big holes drilling. can used for the circulation and reverse circulation drilling, also can achieve gas inlet and deslagging, this kelly bar can withstand big torque and deslagging is good.
Specification
Copyright:Shijiazhuang Coal Mining Machinery Co., Ltd. ICP:09037270
Design by:
http://www.sjznet.net
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