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发明名称
Drilling apparatus
摘要
申请公布号
US2683587(A)
申请公布日期
1954.07.13
申请号
US19510240519
申请日期
1951.08.06
申请人
LE ROI COMPANY
发明人
GUNNING SAMUEL D.
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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