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发明名称
Expanding underreamer
摘要
申请公布号
US1812044(A)
申请公布日期
1931.06.30
申请号
US19280296597
申请日期
1928.07.31
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
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