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发明名称
Method of and means for tunneling
摘要
申请公布号
US1839888(A)
申请公布日期
1932.01.05
申请号
US19300474347
申请日期
1930.08.11
申请人
O'ROURKE JOHN F
发明人
O'ROURKE JOHN F.
分类号
E21D9/06
主分类号
E21D9/06
代理机构
代理人
主权项
地址
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