Home / Standards / GB/T 1357 GB/T 1357 Abolished Modules of involute cylindrical gears 渐开线圆柱齿轮模数 Standard Type GBT ICS 21.200 CCS J17 Status 废止 Issue Date 1987-06-11 Implementation 1988-05-01 Responsible Dept 国家标准委 Drafting Unit 国家标准委