ISO 559:1977

91.140.60 91.140.40 91.140.80 77.140.75

Building services engineering & equipment, Supply and disposal systems for buildings, Drainage systems Building services engineering & equipment, Supply and disposal systems for buildings, Water supply systems Building services engineering & equipment, Supply and disposal systems for buildings, Gas supply systems Building services engineering & equipment, Sewage water engineering, Drainage systems Building services engineering & equipment, Water supply, Water supply systems Mechanical engineering foundations & materials, Steel profiles. Steel wire. Wire ropes and link chains, Steel pipes and tubes for specific use