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DIN EN 1514-6 [CURRENT] references following documents:

Document number Edition Title
EN ISO 6708 1995-07 Pipework components - Definition and selection of DN (nominal size) (ISO 6708:1995) More 
EN 1092-3 2003-09 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories PN designated - Part 3: Copper alloy flanges More 
EN 1092-4 2002-05 Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 4: Aluminium alloy flanges More