Safety devices for gas supply installations operating at working pressures up to 100 bar; pressure relief governors and safety shut-off devices— 15 стр.
Plans for public utilities, water resources management and for long-distance pipelines; Maps and plans for water engineering, flood and coastal protection— 13 стр.
Plans for Public Utilities, Water Resources and Long-distance Lines; Plans for Long-distance Pipelines, Technical Regulation of the DVGW (German Gas and Water Engineers Association)— 11 стр.