Home / Standards / GB/T 4728.1-1985 GB/T 4728.1-1985 Abolished Graphical symbols for electrical diagrams--General imformation 电气图用图形符号 总则 Standard Type GBT ICS 29.020 CCS K04 Status 废止 Issue Date 1985-11-01 Implementation 1986-05-01 Responsible Dept N/A Drafting Unit N/A