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发明名称
Rotary bit
摘要
申请公布号
US2226655(A)
申请公布日期
1940.12.31
申请号
US19390299541
申请日期
1939.10.14
申请人
BEAVEN WILLIAM J
发明人
BEAVEN WILLIAM J.
分类号
E21B10/42;E21B10/62
主分类号
E21B10/42
代理机构
代理人
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