Its builders pushed ahead in three dimensions with such construction works as footing excavation and concrete placing of more than 1,000 cubic meters.

The county provided several thousand cubic meters of gravel and more than 100,000 blocks and finished the construction of retaining wall and storage cellar in a short span of time.

Workers and technicians of the factory fixed up tens of kinds of equipment and facilities and confirmed proper technical indices through test run of each process and established a computer integrated manufacturing.

Supreme Leader Kim Jong Un visited the factory in October last year and in April this year, noting with high appreciation that its construction is perfect.