The gas purification workshop of the Hungnam Fertilizer Complex replaced a smelting furnace with a modern one and updated its purification process, thus reducing the percentage of hydrogen sulfide in mixed gas to a fourth.

The casting workshop of the Kumsong Tractor Plant remodeled a low-frequency induction furnace into high-frequency one to improve the casting quality.

The Phyongwon Agricultural Chemicals Factory has developed new kinds of mixed insecticides suitable to soil conditions of the western coastal granaries of the country.

Such successes have been achieved by the Namhung Youth Chemical Complex and the Haeju Trailing Farm Machine Factory.