Home / Standards / GB/T 12937-2008 GB/T 12937-2008 Active Terms relating to coal petrology 煤岩术语 Standard Type GBT ICS 73.040 CCS D26 Status 现行 Issue Date 2008-09-18 Implementation 2009-04-01 Responsible Dept 中国煤炭工业协会 Drafting Unit 中国煤炭工业协会