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发明名称
Drill bits
摘要
申请公布号
US2901224(A)
申请公布日期
1959.08.25
申请号
US19550495535
申请日期
1955.03.21
申请人
REED ROLLER BIT COMPANY
发明人
BOICE ELVIN G.;PETER ROBERT G.
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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