BS 1560-3.2:1990 Circular flanges for pipes, valves and fittings (Class designated). Steel, cast iron and copper alloy flanges. Specification for cast iron flanges
1990BS 1560-3.2:1990 Circular flanges for pipes, valves and fittings (Class designated). Steel, cast iron and copper alloy flanges. Specification for cast iron flanges
1990BS 1560-3.2:1989 Circular flanges for pipes, valves and fittings (Class designated) - Steel, cast iron and copper alloy flanges - Specification for cast iron flanges