Home / Standards / GB/T 15589-2013 GB/T 15589-2013 Active Classification of microlithotype 显微煤岩类型分类 Standard Type GBT ICS 73.040 CCS D26 Status 现行 Issue Date 2013-12-17 Implementation 2014-05-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A