DIN 4922-2
Steel Filter Pipes for Drilled Wells with Screwed Connection DN 100 to DN 500
废止
发布日期 :
2001-04-01
实施日期 :
DIN 4920
DN 32 to DN 100 threaded steel filter pipes with slot perforation for drilled wells and driven wells
废止
发布日期 :
2001-07-01
实施日期 :