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发明名称
Drill device
摘要
申请公布号
US2579720(A)
申请公布日期
1951.12.25
申请号
US19480059523
申请日期
1948.11.12
申请人
ATKINSON THOMAS P
发明人
ATKINSON THOMAS P.
分类号
E21B10/36
主分类号
E21B10/36
代理机构
代理人
主权项
地址
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