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发明名称
Jack knife mine post
摘要
申请公布号
US1835515(A)
申请公布日期
1931.12.08
申请号
US19300446047
申请日期
1930.04.21
申请人
O'BRYAN WILLIAM V
发明人
O'BRYAN WILLIAM V.
分类号
E21D15/08
主分类号
E21D15/08
代理机构
代理人
主权项
地址
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