Home / Standards / GB/T 7924-1987 GB/T 7924-1987 Abolished Optical projection profile grinding machines--Parameters 光学曲线磨床 参数 Standard Type GBT ICS 25.080.50 CCS J55 Status 废止 Issue Date 1987-06-11 Implementation 1988-01-01 Responsible Dept N/A Drafting Unit N/A