Home / Standards / GB 12971.3-1991 GB 12971.3-1991 Abolished Trolley and contact wires for electric traction--Part 3:Aluminium and steel composite trolley and contact wires 电力牵引用接触线 第三部分:钢、铝复合接触线 Standard Type GB ICS 29.060.10 CCS K13 Status 废止 Issue Date 1991-06-06 Implementation 1992-03-01 Responsible Dept 中国电器工业协会 Drafting Unit N/A