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发明名称
Earth drill
摘要
申请公布号
US2401250(A)
申请公布日期
1946.05.28
申请号
US19430504343
申请日期
1943.09.30
申请人
KANDLE CHARLES W
发明人
KANDLE CHARLES W.
分类号
E21B10/44
主分类号
E21B10/44
代理机构
代理人
主权项
地址
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