Home / Standards / JB/T 6957-1993 JB/T 6957-1993 Abolished 精密冲裁件 工艺编制原则 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1993-07-27 Implementation 1994-07-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部