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BS 1139-2:1982

Metal scaffolding-Specification for couplers and fittings for use in tubular scaffolding
standard by BSI Group, 08/28/1987

BS 1501-3:1973

Specification for steels for fired and unfired pressure vessels. Plates.-Corrosion and heat resisting steels. Imperial units
standard by BSI Group, 06/21/1973