... 3. Perfect survice. About us:Shandong Zhengyu Precision Machinery Co.,Ltd is located in Pingyuan Taoyuan Industrial Area, which is ... in China. Zhengyu Precision Machinery Co.,Ltd is specialized in designing, manufacturing, marketing of the machinery tool accessories. The main ... the strong technology, and the scientific management, Zhengyu Machinery is popular for its high precision and the thoughtful ...