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发明名称
Underreamer
摘要
申请公布号
US2012774(A)
申请公布日期
1935.08.27
申请号
US19330662764
申请日期
1933.03.25
申请人
C. E. GLAMANN
发明人
ROE EMMETT J.
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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