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发明名称
Drilling bit
摘要
申请公布号
US1788377(A)
申请公布日期
1931.01.13
申请号
US19290351197
申请日期
1929.03.30
申请人
GEORGE G. OSBORN;CLARENCE H. REED
发明人
BISHOP JOHN H.
分类号
E21B11/00
主分类号
E21B11/00
代理机构
代理人
主权项
地址
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