Pyongyang, May 30 (KCNA) -- The Ryongsong Machine Complex in the DPRK has expanded successes after sending highly efficient compressors to the field of coal industry.

Its steel casting workshops Nos. 1 and 2 improved the technical control over medium frequency induction furnaces and shortened the melting time per charge to increase the production of materials for compressor parts.

They have put the production of different materials on a highly qualitative level by maintaining close cooperation between processes including moulding, drying and casting while improving the quality of molten iron by introducing advanced method.

Similar successes have been witnessed at other workshops. -0-