Pig iron and spiegeleisen in pigs, blocks or other primary forms

Alloy pig iron and spiegeleisen, in pigs, blocks or other primary forms
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Nonalloy pig iron in pigs, blocks or other primary forms, containing, by weight, < 0,5% of phosphorous
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Nonalloy pig iron in pigs, blocks or other primary forms, containing by weight > 0,5% phosphorus
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