Hongji Group Product Superiority. The stone production line which is also called sandstone production line is the major production line used in the industries of productive building, road and railway. The stone production line made by Hongji mining machinery has some merits such as higher automation, higher crushing ration, higher productivity, big capacity, and the finished material is the.Stone, Concrete Crushing Equipment for Gravel Making and Concrete Crushing Equipment for Gravel Making and Mineral Processing. ( ISO Certificate ),US $ 1 The finished products are cube CHINA Coal Ming Equipment . Beechwood.