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发明名称
Expanding rotary underreamer
摘要
申请公布号
US1796546(A)
申请公布日期
1931.03.17
申请号
US19230632295
申请日期
1923.04.16
申请人
JOHN GRANT
发明人
CAMPBELL WILLIAM H.;MAXWELL WILLIAM H.
分类号
E21B10/34
主分类号
E21B10/34
代理机构
代理人
主权项
地址
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