Home / Standards / GB 5751-1986 GB 5751-1986 Abolished Classification of Chinese coals 中国煤炭分类 Standard Type GB ICS 73.040 CCS D20 Status 废止 Issue Date 1986-01-09 Implementation 1986-10-01 Responsible Dept 中国煤炭工业协会 Drafting Unit N/A