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发明名称
Rotary underreamer
摘要
申请公布号
US1893693(A)
申请公布日期
1933.01.10
申请号
US19310510998
申请日期
1931.01.24
申请人
JOHN GRANT
发明人
ALOI MILLIO FRANK
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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