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发明名称
Drill bit
摘要
申请公布号
US2690935(A)
申请公布日期
1954.10.05
申请号
US19490104428
申请日期
1949.07.13
申请人
GEORGE E. FAILING COMPANY
发明人
ALEXANDER EMMETT L.
分类号
E21B10/22;F16C43/06
主分类号
E21B10/22
代理机构
代理人
主权项
地址
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