DIN EN ISO 9606-3:1999 Approval testing of welders - Fusion welding - Part 3: Copper and copper alloys (ISO 9606-3:1999); German version EN ISO 9606-3:1999
DVS 1901-2-1997 Quality requirements for small and medium-sized companies according to DIN EN 729 Requirements for welding companies
DVS 1902-1-2001 history
2001DVS 1902-1-2001 Welded steel operations and personnel requirements in domestic installations
1996DVS 1902-1-1996 Welded steel operations and personnel requirements in domestic installations
1988DVS 1114-1988 DVS courses; Gas welding in the region DVGW-TRGI 1986
1987DVS 1902-1-1987 Welded steel in domestic installations; operating and personnel requirements
1983DVS 1114-1983 DVS training course; gas welding within the scope of DVGW-TRGI 1972
1976DVS 1114-1976 DVGW-TRGI 1972 Regional Gas Welder Training and Testing