DIN 21558:1990-05 - Draft Mine support; powered support; requirements, testing

标准编号：DIN 21558:1990-05 - Draft

英文标题：Mine support; powered support; requirements, testing

德文标题：Grubenausbau; Schreitausbau; Anforderungen, Prüfung

发布日期：1990-05

标准预览图