DIN EN ISO 13968:2009-01 Plastics piping and ducting systems - Thermoplastics pipes - Determination of ring flexibility (ISO 13968:2008); German version EN ISO 13968:2008
2009DIN EN ISO 13968:2009-01 Plastics piping and ducting systems - Thermoplastics pipes - Determination of ring flexibility (ISO 13968:2008); German version EN ISO 13968:2008