八十年代初先后研制成功了定柱式旋臂起重机、壁柱式旋臂起重机,并取得了国家实用新型专利证书。
The early eighties have successfully developed a set of crane column Arm, Arm type cranes, and achieved a national utility model patent.
八十年代初先后研制成功了定柱式旋臂起重机、壁柱式旋臂起重机,并取得了国家实用新型专利证书。
The early eighties have successfully developed a set of crane column Arm, Arm type cranes, and achieved a national utility model patent.
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