Water conduit for fire extinguishing – Planning, installation, operation and maintenance of fire hose systems and pillar fire hydrant and underground fire systems
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2012

Water conduit for fire extinguishing – Planning and installation of fire hose systems and water conduit for fire extinguishing
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2009