Dị ka mkpa ndị ahịa si dị, dị iche iche nkọwa nke Hartwan ebuli n'elu ikpo okwu ụgbọ ala, Hartwan ebuli hydraulic nyiwe, Hartwan hydraulic ikpo okwu lifts, Hartwan ụgbọ-n'ịnyịnya ikuku ọrụ nyiwe nwere ike ahaziri.Nabata ọhụrụ na ochie ahịa na bia kparita uka.