The Indian child was in the back room of his parents' kebab shop when the accident happened, Il Gazzetino reported.
His father immediately called the White Cross, a rescue association which operates in the German-speaking region of Italy.
Fire services and a physician also rushed to the shop, but were unable to safely remove the child’s arm from the grinder.
He was later flown to a hospital in Innsbruck, Germany, where surgeons at a specialist centre for limbs, treated the child.
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