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发明名称
Well bit
摘要
申请公布号
US1961390(A)
申请公布日期
1934.06.05
申请号
US19330655546
申请日期
1933.02.07
申请人
GLOBE OIL TOOLS CO.
发明人
RAGADALE JOHN B.
分类号
E21B10/62
主分类号
E21B10/62
代理机构
代理人
主权项
地址
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