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发明名称
Underreamer
摘要
申请公布号
US1764133(A)
申请公布日期
1930.06.17
申请号
US19270161758
申请日期
1927.01.18
申请人
JOHN GRANT
发明人
WEISGERBER EDWIN C.
分类号
E21B10/00;E21B10/32
主分类号
E21B10/00
代理机构
代理人
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地址
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