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发明名称
Apparatus for jacking tunnels
摘要
申请公布号
US2967401(A)
申请公布日期
1961.01.10
申请号
US19550494755
申请日期
1955.03.16
申请人
AMERICAN-MARIETTA COMPANY
发明人
WASHABAUGH EDWARD P.
分类号
E21D9/00
主分类号
E21D9/00
代理机构
代理人
主权项
地址
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