Home / Standards / GB/T 4056-2019 GB/T 4056-2019 Active Dimensions of ball and socket couplings of string insulator units 绝缘子串元件的球窝联接尺寸 Standard Type GBT ICS 29.080.10 CCS K48 Status 现行 Issue Date 2019-12-10 Implementation 2020-07-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A