..............page:10-11+26
..............page:16-18+23
Improvement of 60 tons punching press
Ma Ke;Shan Xiaowei;Meng Fanxue;Technical Center;Harbin Bearing Group Corporation;Material Purchasing Department;Harbin Bearing Group Corporation;Production Management Department;Harbin Bearing Group Corporation;
..............page:30-32
..............page:44-45+53