Home / Standards / GB/T 20305-2006 GB/T 20305-2006 Active Calibrated round steel link lifting chains - Guidelines to proper use and maintenance 起重用钢制圆环校准链 正确使用和维护导则 Standard Type GBT ICS 53.020.30 CCS J80 Status 现行 Issue Date 2006-07-19 Implementation 2007-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A