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| China |
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Liaoning Dongyu Oil Pipe Manufacturing Co. Ltd |
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Liaoning Shenyu Oil Pipe Manufacturing Co. Ltd. |
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Qinhuangdao Zhongxing Petroleum Machinery Manufacture Co., Ltd |
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1st Huabei OCTG Machinary Co. Ltd. |
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PetroMaterials cangzhuo co., Ltd
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Jiangyin Longcheng Drilling Equipment Manufacture Co. |
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Yangzhou Tongya Steel Pipe Co. Ltd. |
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PetroMaterials Corporation Wakayama Works |
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U.S.A |
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PetroMaterials USA, Inc. |
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