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    Qingdao Leader Int'l Trade & Inustry Co.,Ltd which is the sales office of Laizhou Toppower Petroleum Machinery Co.,Ltd and Qingdao Green Chemicals Co.,Ltd. Focusing on producing petroleum machinery, chemicals for oil & gas, oil tools, oil tube, casing tube and coupling for 15 years, most of our products are supplied to Sinopec, CNPC and BP and Shell etc.  ...

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