Home / Standards / CB 971-1981 CB 971-1981 Abolished 钢质带滚轮跳板 Standard Type CB97 ICS N/A CCS N/A Status Abolished Issue Date 1981-01-01 Implementation 1982-04-01 Centralized Committee 中国船舶工业集团公司 Issuing Authority 中国船舶工业集团公司