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	Shanghai Baosteel Group Corp.
	MITSUI & Co., Ltd.
	SINOPEC Catalyst Co., Ltd.
	Tianjin Pipe International Economic&Trading Corporation
	Julong Steel Pipe Co.,Ltd.
	Wuxi Seamless Oil Pipes Co., Ltd.
	Yantai Lubao Steel Tube Co., Ltd.
	1st Machinery Works of North China Petroleum