Pipes and fittings of unplasticized poly(vinyl chloride) (PVC-U) for cable ducting – Dimensions and technical delivery conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/1997

Pipes and fittings of unplasticized poly(vinyl chloride) (PVC-U) for cable ducting – Dimensions and technical delivery conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2012