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经营范围
发明名称
Three-cutter drill
摘要
申请公布号
US2104820(A)
申请公布日期
1938.01.11
申请号
US19350055371
申请日期
1935.12.20
申请人
SCOTT FLOYD L
发明人
SCOTT FLOYD L.
分类号
E21B10/16
主分类号
E21B10/16
代理机构
代理人
主权项
地址
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