Decree amending Decree No. 165 / 2002 Coll., on the separate ventilation of mining activities in continuous mines, as amended by Decree No. 56 / 2007 Coll., Decree No. 22 / 1989 Coll., on the safety and health at work and on the safety of operations in mining activities and on the extraction of non-reserved minerals in the underground, as amended, Decree No. 4 / 1994 Coll., laying down requirements for the design and construction of buildings and equipment for the distribution and insulation of miners, as amended