Home / Standards / GB 12971.4-1991 GB 12971.4-1991 Abolished Trolley and contact wires for electric traction--Part 4:Aluminium-steel and aluminium alloy composite trolley and content wires 电力牵引用接触线 第四部分:钢、铝及铝合金复合接触线 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