Home / Standards / GB/T 21938-2021 GB/T 21938-2021 Active Earth-moving machinery─Hydraulic excavator and backhoe loader lowering control device─Requirements and tests 土方机械 液压挖掘机和挖掘装载机下降控制装置 要求和试验 Standard Type GBT ICS 53.100 CCS P97 Status 现行 Issue Date 2021-12-31 Implementation 2022-07-01 Responsible Dept 中国机械工业联合会 Drafting Unit N/A