Home / Standards / GB/T 12760-1991 GB/T 12760-1991 Abolished Cylindrical worm and wormwheel information of the dimensional data to be given on the drawing 圆柱蜗杆、蜗轮图样上应注明的尺寸数据 Standard Type GBT ICS 21.200 CCS J17 Status 废止 Issue Date 1991-03-22 Implementation 1992-01-01 Responsible Dept 国家标准委 Drafting Unit N/A