N'ebe nnukwu ebe a na-egwuputa ihe na ebe a na-egwupụta ihe, ihe ndị na-egwupụta ihe n'elu hama bụ ihe a na-ejikarị na-egwupụta nkume. Site na omimi nke mita 5-15, igwe na-egwupụta hama n'elu nwere ike ịbawanye arụmọrụ nke ọma. Ọ bụrụ na ị na-eche banyere ịrụ ọrụ nke Ngwuputa, mgbe ahụ, n'elu hammer drill bụ ihe ịrụ ụka adịghị ya na nhọrọ gị kacha mma. Anyị nwere ike ịnye igwe na-egwupụta hama dị elu na onye ọkwọ ụgbọ ala kwụsiri ike na China. N'otu oge ahụ, ihe nkwụnye ihe nke shank anyị, mkpara olulu mmiri, na ihe nkedo olulu ahụ bụkwa ihe kachasị elu.