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发明名称
Rotary bit
摘要
申请公布号
US2181395(A)
申请公布日期
1939.11.28
申请号
US19380243401
申请日期
1938.12.01
申请人
DEAN CHARLES A
发明人
DEAN CHARLES A.
分类号
E21B10/10;E21B10/46;E21B10/50
主分类号
E21B10/10
代理机构
代理人
主权项
地址
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