2011DVS 1901-1-2011 Quality requirements for companies - welding of support structures, rail vehicles and pressure-bearing equipment
2005DVS 1901-1-2005 Quality requirements for SMEs - welding of construction, pressure equipment and rolling stock
1997DVS 1901-1-1997 "Quality requirements on small and medium-sized enterprises - Welding at high-rise buildings, equipment and pressure vessels"
1984DVS 1901-1984 "Quality requirements on small and medium-sized enterprises; welding at high-rise buildings, equipment and pressure vessels"
DVS 1901-2-1996 Quality requirements for small and medium-sized companies Requirements of European regulations for welding companies has been changed from DVS 1901-1984 "Quality requirements on small and medium-sized enterprises; welding at high-rise buildings, equipment and pressure vessels".