NIOBIUM (METALLURGY)
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BTHEAVY METALS (METALLURGY)
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UDC669.293
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Descriptor GERNIOB (METALLURGIE)
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Descriptor ENGNIOBIUM (METALLURGY)
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Descriptor FRENIOBIUM (MÉTALLURGIE)
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NTNIOBIUM ALLOYS
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RTNIOBIUM (CHEMICAL ELEMENTS)