China 'GB 12971.4-1991
' standard english version:
NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA
GB 12971.4-1991
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
Issued Date:1991-06-06
Implemented Date:1992-03-01
Issued by:
The Standardization Administration of the People's Republic of China
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