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发明名称
Drill bit sharpening mechanism
摘要
申请公布号
US2345100(A)
申请公布日期
1944.03.28
申请号
US19430479322
申请日期
1943.03.16
申请人
COTTON EARL I
发明人
COTTON EARL I.
分类号
B21K5/06
主分类号
B21K5/06
代理机构
代理人
主权项
地址
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