Draft Document – Transport and storage of pipes, fittings and prefabricated manhole components made of concrete and steel reinforced concrete
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 07/01/2012

Draft Document – Transport and storage of pipes, fittings and prefabricated manhole components made of concrete and steel reinforced concrete
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/2014