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一种正向-反向螺旋铣孔刀具

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First Author:Dong Zhigang

Disigner of the Invention:Renke Kang,杨国林,zhuxianglong,尉言振,Dongming Guo

Application Number:CN201810420291.8

Authorization Date:2018-05-04

Authorization number:CN108637337A

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