Home / Standards / GB/T 21159.1-2007 GB/T 21159.1-2007 Active Equipment for sowing and planting - Disks - part 1: Concave disks type D1 - Dimensions 播种和种植机械 圆盘 第1部分：D1型凹面圆盘 尺寸 Standard Type GBT ICS 65.060.30 CCS B91 Status 现行 Issue Date 2007-11-01 Implementation 2008-01-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A