Site na onye na-akpụ nkụ nke Yichen, ị nwere ike nweta okwute ziri ezi na mwepụ ihe na obere mkpọtụ na ịma jijiji. Emebere usoro Yichen Drum Cutter maka igwu okwute okwute, mkpọtu, ịcha n'okpuru ala, profaịlụ ọwara, trenchi na ngwa ndị ọzọ. Ngwa a na-ahụkarị n'iwu ihe owuwu bụ igwu kol olulu site na onye na-egbutu nkụ. Dị ka a pụrụ ịtụkwasị obi ika cutter, Yichen na-enye ọtụtụ ụlọ ọrụ akụrụngwa ihe owuwu.
GỤKWUOZipu oziDị ka ihe a na-ahụkarị na ihe owuwu nke oge a, ọtụtụ ndị ahịa na-ahụ onye na-akụ drum n'anya n'ihi ọrụ ya dị mfe, ihe nkiri eji eme ihe na mmetụta igwe nri dị mma. Drum cutter na-arụ ọrụ pụrụ iche n'ịgbapụta kol na-emepe emepe. Mpụta ya na-eme ka ngwupụta coal dị mfe ma dị nchebe. –— Onye na-egbu ihe na-eme ka Ngwuputa nke Coal Mine mepere emepe ka ọ dị mfe
GỤKWUOZipu ozi