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发明名称
Rotary bit
摘要
申请公布号
US1938246(A)
申请公布日期
1933.12.05
申请号
US19320640484
申请日期
1932.10.31
申请人
CARISON ANTHONY E
发明人
CARISON ANTHONY E.
分类号
E21B10/30
主分类号
E21B10/30
代理机构
代理人
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