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发明名称
Circular digger
摘要
申请公布号
US2830790(A)
申请公布日期
1958.04.15
申请号
US19550522652
申请日期
1955.07.18
申请人
KEMPER EDMUND J
发明人
KEMPER EDMUND J.
分类号
E21B6/00;E21B7/00
主分类号
E21B6/00
代理机构
代理人
主权项
地址
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