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发明名称
Drill bit
摘要
申请公布号
US2697014(A)
申请公布日期
1954.12.14
申请号
US19510263053
申请日期
1951.12.24
申请人
REED ROILER BIT COMPANY
发明人
BOICE ELVIN G.;PETER ROBERT G.
分类号
E21B10/20
主分类号
E21B10/20
代理机构
代理人
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地址
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