Decree of the Czech Office of Labour Security and the Czech Mining Office No. 551 / 1990 Coll.

Decree of the Czech Labour Safety Authority and the Czech Mining Authority, amending and supplementing the Order of the Czech Labour Safety Authority and the Czech Mining Authority No. 18 / 1979 Coll., defining dedicated pressure equipment and laying down certain conditions to ensure their safety, as amended by the Order of the Czech Labour Safety Authority and the Czech Mining Office No. 97 / 1982 Coll.