BS 970-4:1970(1998)
Specification for Wrought steels in the form of blooms, billets, bars and forgings — Part 4 : Valve steels
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BS 970-4:1970(1998)
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BS 970-4:1970(1998)
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1970
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BS 970-4:1970(1998)
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BS 970-4:1970(1998)
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