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valtspink paksuseinaliste õõneskehade valtsimiseks õmbluseta torude tootmisel (vt õõnevaltsimine), a rolling mill designed to make seamless tubes from a solid bar of metal (see: rotary piercing)
piercing mill . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/piercing%20mill/1/eng (12.07.2026)