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koonuseliste kettakujuliste valtsidega valtspink õõnevaltsimiseks; kasutatakse peam suure läbimõõduga torude tootmisel (vrd Mannesmanni valtspink), rotary piercing with large conical discs (compare: Mannesmann mill)
Stiefel mill . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/Stiefel%20mill/1/eng (02.07.2026)
