Home / Standards / GB/T 4414-2013 GB/T 4414-2013 Active Methods of sampling and sample preparation of tungsten concentrates in bags 包装钨精矿取样、制样方法 Standard Type GBT ICS 77.120.99 CCS H63 Status 现行 Issue Date 2013-09-27 Implementation 2014-08-01 Responsible Dept 中国有色金属工业协会 Drafting Unit N/A