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DIN CEN/TS 1591-3 references following documents:

Document number Edition Title
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