Home / Standards / DZ/T 0056-1993 DZ/T 0056-1993 Active 水文水井钻探三牙轮钻头 Standard Type DZ ICS N/A CCS N/A Status Active Issue Date 1993-02-19 Implementation 1993-07-01 Centralized Committee 地质矿产部 Issuing Authority 地质矿产部