... such as cross universal coupling, drum coupling, expansion coupling, hydraulic safe coupling, wobbler and star elastic coupling, heavy diaphragm ... -type universal coupling, WGG through-type drum coupling, hydraulic safety coupling for locomotives etc, are appraised as top ... medium wide-strip mills for Xingtai Delong Steel & Iron Co., Ltd., Benxi Beitai Steel Company, Kunming Yuxi Steel & Iron Company ...