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Copyright(C)：BEIJING OILFIELD TECHNOLOGIES CO., LTD.
Head Office：No.3 Building, No.33 Zique Road, Haidian District, Beijing  Tel.：0086-10-89681198  Fax.：0086-10-89687590　
Email：sales@ofdtechnologies.com   Beijing Register No.：ICP No.190456983-1
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