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郑州水利机械研究所与三门峡水工机械厂密切合作,共同研制成功一台SS-Ⅱ型480/12门式起重机。该机虽是专为援建毛里塔尼亚友谊港工程急用而研制,也是继SS-Ⅰ门式起重
Zhengzhou Water Conservancy Machinery Research Institute and Sanmenxia Hydraulic Machinery Plant in close cooperation to jointly develop a successful SS-Ⅱ type 480/12 gantry crane. Although the aircraft is designed to aid the urgent construction of friendship port in Mauritania developed, but also following the SS-Ⅰ gantry crane