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发明名称
Well bit
摘要
申请公布号
US2107626(A)
申请公布日期
1938.02.08
申请号
US19360074164
申请日期
1936.04.13
申请人
GLOBE OIL TOOLS COMPANY
发明人
CATLAND ALFRED C.
分类号
E21B10/10
主分类号
E21B10/10
代理机构
代理人
主权项
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