显示标签为“ball type Safety and Kelly valves”的博文。显示所有博文
显示标签为“ball type Safety and Kelly valves”的博文。显示所有博文
2016年11月15日星期二

Safety and Kelly Valves

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We supply  API Spec 7-1    Kelly Valve,КШЦ ,Kelly Cock,Drill Pipe Safety Valve,Safety and Kelly Valves,Upper Kelly Valve,Lower Kelly Valve,K...