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发明名称
APPARATUS FOR JACKING TUNNELS
摘要
申请公布号
CA634612(A)
申请公布日期
1962.01.16
申请号
CAD634612
申请日期
申请人
AMERICAN-MARIETTA COMPANY
发明人
EDWARD P. WASHABAUGH
分类号
主分类号
代理机构
代理人
主权项
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