Gear of Hobbing Machine , Northern Heavy Industries Group Co.,Ltd(China NHI),listed among Top 500 Chinese Enterprises,The major products include tunnel boring equipments,China Apron Feeder,China Stacker Reclaimer,Conveying Equipment, bucket wheel stacker reclaimer, circular stacker reclaimer, metallurgy equipments, mining equipments, coal machineries, power equipments,etc.With all the four qualifications recognized by ISO9001 Quality Management System.