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一种自动调整孔径的螺旋铣孔装置及其工作方法

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First Author:Renke Kang

Disigner of the Invention:Dong Zhigang,杨国林,zhuxianglong,王欢

Application Number:CN201410637775.X

Authorization Date:2014-11-12

Authorization number:CN104439445A

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