Home / Standards / GB/T 1204-1975 GB/T 1204-1975 Abolished Chamfers for optical parts 光学零件的倒角 Standard Type GBT ICS 37.020 CCS N30 Status 废止 Issue Date 1975-06-05 Implementation 1976-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A