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发明名称
Rotary underreamer and cutter element therefor
摘要
申请公布号
US1844357(A)
申请公布日期
1932.02.09
申请号
US19300422583
申请日期
1930.01.22
申请人
JOHN GRANT
发明人
GRANT JOHN
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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