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Products through continuous improvement and upgrading of technology, its structure, performance, quality, have reached the international advanced level. In addition to a standard national standards, industry standards, but also by the United States ANSI, API, ASME, Japan's JIS, the British BS, the German DIN and other international advanced standards. And rigorous review by international organizations have made the American Petroleum Institute API6D certification, the International Organization for Standar |
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