Home / Standards / GB/T 12370-1990 GB/T 12370-1990 Abolished Terminology for bevel and hypoid gears 锥齿轮和准双曲面齿轮 术语 Standard Type GBT ICS 21.200 CCS J17 Status 废止 Issue Date 1990-06-26 Implementation 1991-03-01 Responsible Dept 国家标准委 Drafting Unit N/A