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toormalm terase tootmiseks martäänahjudes (see: martäänahi), pig iron used for steel production in an open-heart furnaces (see: open-hearth furnace)
open-hearth iron . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/open-hearth%20iron/1/eng (15.07.2026)