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| Standard Code | Standard Title | Standard Class | Order |
|---|---|---|---|
| GB/T 4389-2013 |
Double-headed open-ended wrenches,double-headed box wrenches and combination wrenches - Maximum widths of heads 双头呆扳手、双头梅花扳手、两用扳手 头部外形的最大尺寸 |
China National Standards Double ended wrenches |
 English PDF |
| GB/T 4391-2008 |
Double-ended wrenches - Size pairing 双头扳手 对边尺寸组配 |
China National Standards Double ended wrenches |
English PDF |
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