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