What does the May 4th edition of Coal Mine Ventilation mean?

1 .5 drawings: mine ventilation system diagram, water supply and dustproof system diagram, fire prevention and extinguishing (nitrogen injection by grouting) system diagram, gas drainage system diagram and safety monitoring system diagram.

2. Four sections: local ventilation management section, ventilation facility management section (ventilation instrument management section), dust prevention facility management section and safety monitoring management section.