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发明名称
Rotary drill bit
摘要
申请公布号
US2320137(A)
申请公布日期
1943.05.25
申请号
US19410406492
申请日期
1941.08.12
申请人
KAMMERER ARCHER W
发明人
KAMMERER ARCHER W.
分类号
E21B10/14
主分类号
E21B10/14
代理机构
代理人
主权项
地址
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