Home / Standards / GB/T 24503-2009 GB/T 24503-2009 Abolished Mining-Drive sprocket for chains (round link) 矿用圆环链驱动链轮 Standard Type GBT ICS 73.100.40 CCS D93 Status 废止 Issue Date 2009-10-30 Implementation 2010-04-01 Responsible Dept 中国煤炭工业协会 Drafting Unit 中国煤炭工业协会