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一种具有回勾刃的手工钻头

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First Author:jiazhenyuan

Disigner of the Invention:郝佳轩,Fuji Wang,成德,郑嘉全,谷天雨,闫建博,樊俊峰

Application Number:CN201811199427.3

Authorization Date:2018-10-16

Authorization number:CN109262738A

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