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发明名称
Drill bit
摘要
申请公布号
US2060354(A)
申请公布日期
1936.11.10
申请号
US19350034180
申请日期
1935.08.01
申请人
THE GUIBERSON CORPORATION
发明人
THAHELD FERI A.
分类号
E21B10/20
主分类号
E21B10/20
代理机构
代理人
主权项
地址
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