Home / Standards / GB/T 17670-1999 GB/T 17670-1999 Abolished Unified catologue for natural stone 天然石材统一编号 Standard Type GBT ICS 91.100.20 CCS Q21 Status 废止 Issue Date 1999-02-08 Implementation 1999-08-01 Responsible Dept 中国建筑材料联合会 Drafting Unit N/A