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发明名称
Drilling tool
摘要
申请公布号
US2575826(A)
申请公布日期
1951.11.20
申请号
US19470733501
申请日期
1947.03.10
申请人
MECOM JOHN W
发明人
MECOM JOHN W.
分类号
E21B4/06
主分类号
E21B4/06
代理机构
代理人
主权项
地址
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