Draft Document – Pipes and fittings of polypropylene (PP) for buried cable ducting – Dimensions and technical delivery conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/2016

Draft Document – Pipes and fittings of polypropylene (PP) for buried cable ducting – Dimensions and technical delivery conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2010