Those members active at the Ryongdung Coal Mine under the Kujang Area Coal-Mining Complex made a new type of charger to raise the efficiency of blasting and the tunneling speed.

The three-revolution team members at the December 5 Youth Mine manufactured and installed a high-efficiency dust collecting device in cooperation with technicians and workers.

Those in Sonchon County established a new process of producing compound fertilizer conducive to the soil improvement.

Those in Taegwan County made success in producing sanitary ware, curved pipes and insulators with locally available raw materials.