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发明名称
Earth boring
摘要
申请公布号
US2869825(A)
申请公布日期
1959.01.20
申请号
US19530388175
申请日期
1953.10.26
申请人
PHILLIPS PETROLEUM COMPANY
发明人
CRAWFORD FRANCLS W.
分类号
E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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