Home / Standards / GB/T 17920-1999 GB/T 17920-1999 Active Earth-moving machinery--Lift-arm support devices 土方机械 提升臂支承装置 Standard Type GBT ICS 53.100 CCS P97 Status 现行 Issue Date 1999-12-06 Implementation 2000-06-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A