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经营范围
发明名称
Posthole digger
摘要
申请公布号
US2239024(A)
申请公布日期
1941.04.22
申请号
US19390275983
申请日期
1939.05.26
申请人
VANCE EDWARD J
发明人
VANCE EDWARD J.
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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