Home / Standards / JB/T 4120-1993 JB/T 4120-1993 Abolished 大型锻造合金钢支钢支承辊 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1993-09-21 Implementation 1994-07-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部