DIN 22100-4 E:2009 Draft Document - Articles and materials from synthetic for use in underground mines - Part 4: Flat air ducts - Safety requirements, testing, marking
2010DIN 22100-4:2010-10 Articles and materials from synthetic for use in underground mines - Part 4: Flat air ducts - Safety requirements, testing, marking
2010DIN 22100-4:2010 Articles and materials from synthetic for use in underground mines - Part 4: Flat air ducts - Safety requirements, testing, marking
1993DIN 22100-4:1993 Articles and materials from synthetic for use in underground mines; flat air ducts; safety requirements, testing, marking