Home / Standards / GB/T 4391-2008 GB/T 4391-2008 Active Double-ended wrenches - Size pairing 双头扳手 对边尺寸组配 Standard Type GBT ICS 25.140.30 CCS J47 Status 现行 Issue Date 2008-12-30 Implementation 2009-09-01 Responsible Dept 中国轻工业联合会 Drafting Unit 中国轻工业联合会