Those of the Tokchon Coal Mine under the Tokchon Area Coal-Mining Complex introduced a method of operating pumps at full capacity and developed a protective chip so as to raise profitability.

They invented dozens of technical innovations, including methods of lightening different kinds of jigs and increasing mucking capacity as well as a portable concrete sprayer.

Those of the Sochang Youth Coal Mine and the Jenam Coal Mine introduced the methods of lengthening the span of life of bearings and developed a protective device, etc. to ensure the normal coal production.

There took place an exhibition for sharing inventions and technical innovations of the first quarter of the year.

The Kaechon Area Coal-Mining Complex produced different kinds of equipment and jigs and power-saving devices with its own efforts to positively introduce them to production. It also introduced a high-effective hewing method and found out a practical way for effectively recycling spare parts.

Other coal-mining complexes, too, registered signal successes in improving their production technologies.

A mass technological innovation movement for spawning valuable technical innovations is launched in the coal industrial sector.