Plastics piping systems for renovation of underground gas supply networks - Part 1: General (ISO 11299-1:2018); German version EN ISO 11299-1:2018— 27 стр.
Plastics piping systems for renovation of underground gas supply networks - Part 1: General (ISO 11299-1:2011); German version EN ISO 11299-1:2013— 22 стр.