Zhengzhou ZhengJia Industry Co., Ltd. is a joint-stock mining machinery manufacturing enterprise integrated in scientific research, production and marketing. It is located at the High & New Technology Industries Development Zone of Zhengzhou, China with an area of 50 thousand m² Which includes 15, 000 m² Of standard heavy duty industrial workshop. Equipments are more than 160 pieces, including large and medium sized metal processing, riveting and installing equipments. There are more than 660 workers ...