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一种钻孔和螺旋铣孔组合的制孔方法

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First Author:Renke Kang

Disigner of the Invention:Dong Zhigang,杨国林,zhuxianglong,尉言振,Dongming Guo

Application Number:CN201810419601.4

Authorization Date:2018-05-04

Authorization number:CN108608019A

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