Home / Standards / JB/T 6617-1993 JB/T 6617-1993 Abolished 阀门用柔性石墨填料环 技术条件 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1993-05-07 Implementation 1994-01-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部