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经营范围
发明名称
Flare drill
摘要
申请公布号
US2634957(A)
申请公布日期
1953.04.14
申请号
US19500176878
申请日期
1950.07.31
申请人
COYLE WILLIAM E
发明人
COYLE WILLIAM E.
分类号
E21B10/32
主分类号
E21B10/32
代理机构
代理人
主权项
地址
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