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发明名称
Underreamer
摘要
申请公布号
US1878260(A)
申请公布日期
1932.09.20
申请号
US19290339295
申请日期
1929.02.12
申请人
JOHN GRANT
发明人
BUNKER FRANK S.
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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