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发明名称
Core catcher
摘要
申请公布号
US1889277(A)
申请公布日期
1932.11.29
申请号
US19320600804
申请日期
1932.03.23
申请人
DRAPER RAYMOND J
发明人
DRAPER RAYMOND J.
分类号
E21B25/14
主分类号
E21B25/14
代理机构
代理人
主权项
地址
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