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发明名称
Drill bit construction
摘要
申请公布号
US2752965(A)
申请公布日期
1956.07.03
申请号
US19530349922
申请日期
1953.04.20
申请人
MACKEY BRUCE A
发明人
MACKEY BRUCE A.
分类号
B27G15/00
主分类号
B27G15/00
代理机构
代理人
主权项
地址
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