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发明名称
Drill bit
摘要
申请公布号
US2579819(A)
申请公布日期
1951.12.25
申请号
US19470776313
申请日期
1947.09.26
申请人
ENGINEERING LABORATORIES, INCORPORATED
发明人
GREEN WILLIAM G.
分类号
E21B10/22
主分类号
E21B10/22
代理机构
代理人
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