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DK31216D1917-11-191921-03-14Fremgangsmaade til Hindring af Dannelse af overeutektisk Grafit ved Fremstilling af siliciumholdige Støbejærnslegeringer.
DK31216C
(da)
Fremgangsmaade til Fremstilling af Formstykker, der kan forsendes og bearbejdes, af Ferrosilicium og andre Raastoffer, som anvendes ved Fremstilling af Jærnlegeringer.