Igwe iko mpempe akwụkwọ nwere akụkụ abụọ nwere akụkụ nkọwa: bụ igwe na-akpụzi ọtụtụ ọdụ na-akpaghị aka, ya site na nri akwụkwọ akpaaka, akara (mgbidi iko iko), mmanụ, ndochi, kpo oku, Knurling, curling na usoro ndị ọzọ na-aga n'ihu yana nchọpụta fotoelectric, mkpu mmejọ, na-agụta...
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