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一种阶梯微齿双刃带钻锪一体钻头

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First Author:Fuji Wang

Disigner of the Invention:付饶,jiazhenyuan,陈磊,成德,李汝鹏,葛恩德,王贤峰

Application Number:CN201611182140.0

Authorization Date:2016-12-20

Authorization number:CN106624080A

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