ISO 2531:1979 - Ductile iron pipes, fittings and accessories for pressure pipe-lines
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ISO 2531:2009 - Ductile iron pipes, fittings, accessories and their joints for water applications
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ISO 2531:1991 - Ductile iron pipes, fittings and accessories for pressure pipelines
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ISO 2531:2009
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ISO 2531:1998, Ductile iron pipes, fittings, accessories and their joints for water or gas applications : Amazon.in: Books
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