DIN 1239 - DRAFT
DIN 1239 - DRAFT
Draft Document - Coverings for wells, spring water chambers and other water supply construction - Principles for constructionstandard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2018
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2018