Home / Standards / GB/T 21971-2008 GB/T 21971-2008 Abolished Technical specification for YZD range of multi-speed three-phase induction motors for crane application YZD系列起重用多速三相异步电动机技术条件 Standard Type GBT ICS 29.160.30 CCS K26 Status 废止 Issue Date 2008-06-13 Implementation 2009-03-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A