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.

youdao

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.

youdao