Home / Standards / JB/T 2777-1992 JB/T 2777-1992 Abolished PN16.0-32.0MPa无孔透镜垫 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1992-07-20 Implementation 1993-01-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部