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Innovations made in coal production
  Officials and workers of the Chonnae Area Coal-Mining Complex are effecting innovations in the production.
  The complex has intensified planning and guidance for launching a vigorous high-speed tunnelling campaign at the coal mines, thus producing over 10,000 tons of coal more than the same period of last year.
  It is increasing the production while concentrating main efforts on strengthening its own technical forces and material and technical foundations.