DIN 4925-3/A1 - DRAFT [ Withdrawn ] Draft Document - Well screens and casings of unplasticized polyvinylchloride (PVC-U) for tube well - Part 3: DN 250 to DN 400 with trapezoidal thread; Amendment A1

standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2017