亚洲精品伊人久久久大香,日本免费一区二区三区,亚洲日韩av无码,凹凸国产熟女精品视频国语,国产精品一久久香蕉国产线看观看

News

BoTn5000 is the upgraded product of BoTn series hardbanding wires and have passed the product certification by Fearnley Procter Group and NS-1 Level 3 certificate is awarded

Date 2011-12-20

BoTn5000 is the upgraded product of BoTn series hardbanding wires and have passed the product certification by Fearnley Procter Group and NS-1 Level 3 certificate is awarded. So far Hilong’s main products and technology including drill pipe, internal coating as well as hardbanding all passed audit from major international certification authorities and got their approvals. Hilong has become qualified supplier of many international oil & gas companies that its product quality and system have reached the world advanced level.