Rotary subs( or cross over subs acts for conversion and conection of drill stem component in petroleum, natural gas and geology drilling work. It is used mainly for connecting of upper drill tools and lower drill tools during drilling operation
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TIANHE OIL GROUP HUIFENG PETROLEUM EQUIPMENT CO., LTD.VIP会员第13年
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Rotary subs( or cross over subs acts for conversion and conection of drill stem component in petroleum, natural gas and geology drilling work. It is used mainly for connecting of upper drill tools and lower drill tools during drilling operation
