Home / Standards / GB/T 7159-1987 GB/T 7159-1987 Abolished General rules for the formulation of letter symbols in electrotechnology 电气技术中的文字符号制订通则 Standard Type GBT ICS 29.020 CCS K04 Status 废止 Issue Date 1987-10-01 Implementation N/A Responsible Dept 国家标准委 Drafting Unit N/A