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经营范围
发明名称
Earth drill
摘要
申请公布号
US2418601(A)
申请公布日期
1947.04.08
申请号
US19440518845
申请日期
1944.01.19
申请人
THE BUDA COMPANY
发明人
RICHARDS DWIGHT
分类号
E21B7/02
主分类号
E21B7/02
代理机构
代理人
主权项
地址
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