Which subsidiary of Zhenghai Group is the best?

Zhenghai Magnetic Materials is Zhenghai Group Co., Ltd. ... According to relevant information of Zhenghai Group, Zhenghai Group's best subsidiary is Zhenghai Magnetic Materials Co., Ltd., and Zhenghai Group is a key enterprise group in Shandong Province. Zhenghai Group Co., Ltd., the parent company of the group, formerly known as Yantai Electronic Screen Factory, was established in 1990.