Home / Standards / GB/T 4997-2008 GB/T 4997-2008 Active General specification for permanent magnet low speed direct current tachogenerator 永磁式低速直流测速发电机通用技术条件 Standard Type GBT ICS 29.160.20 CCS K24 Status 现行 Issue Date 2008-06-13 Implementation 2009-03-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A