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一种大深径比阶梯孔加工方法

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First Author:zhuxianglong

Disigner of the Invention:Renke Kang,焦振华,Dong Zhigang,Shang GAO,卢成

Application Number:201910544894.3

Authorization Date:2019-06-21

Authorization number:ZL 201910544894.3

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