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发明名称
Drill collar
摘要
申请公布号
US1848128(A)
申请公布日期
1932.03.08
申请号
US19290416467
申请日期
1929.12.26
申请人
HINDERLITER TOOL COMPANY
发明人
HINDERLITER FRANK J.
分类号
E21B10/00;E21B17/16
主分类号
E21B10/00
代理机构
代理人
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地址
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