2023DIN 51531:2023-07 Petroleum waxes - Determination of oil content
2022DIN 51531:2022-12 Blank cap couplings Storz System PN 16 for delivery and suction / Note: Date of issue 2022-11-04*Intended as replacement for DIN 14310 (1986-11), DIN 14311 (1985-04), DIN 14312 (1985-04), DIN 14313 (1989-09).
2012DIN 51531:2012-12 Investigation and assessment of drain and sewer systems outside buildings - Part 1: General requirements; German version EN 13508-1:2012
2012DIN 51531:2012 Petroleum waxes - Determination of oil content