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GB 12971.4-1991 standard english preview version PDF file download



GB Standard Code GB 12971.4-1991
Standard Category China National Standards
GB Standard English Title Trolley and contact wires for electric traction--Part 4:Aluminium-steel and aluminium alloy composite trolley and content wires
GB Standard Chinese Title 电力牵引用接触线 第四部分:钢、铝及铝合金复合接触线
Chinese Version Price $15 USD per 50 pages
English Translation Price About $15  per 1 page; Inquire us for detail price

 
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