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发明名称
Soil auger lifter
摘要
申请公布号
US2564965(A)
申请公布日期
1951.08.21
申请号
US19500162548
申请日期
1950.05.17
申请人
ERNEST JR DAVID H
发明人
JR. DAVID H. ERNEST,
分类号
E21B19/07
主分类号
E21B19/07
代理机构
代理人
主权项
地址
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