DIN 19537-3
DIN 19537-3 Prefabricated high density polyethylene (PE-HD) manholes for use in sewerage systems; dimensions and technical delivery conditions
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/1990
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 11/01/1990