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Where does the Old East Sea belong to Tangshan?

Donghai Special Steel is located in Luanzhou City, Tangshan City. It turned out to be Donghai Special Steel, and the operator was a cousin, one surnamed Lin and the other surnamed Yu. Subsequently, Chairman Lin founded Donghai Special Steel Company in Ciyutuo Town, Luanzhou City. The original Donghai Special Steel Company was handed over to Yu Jianming, and the two brothers separated. Two Donghai special steel companies are the pillar enterprises of Luanzhou City, with large profits and taxes, which have made great contributions to the economy of Luanzhou City.