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发明名称
Twin auger tunneling machine
摘要
申请公布号
US2970661(A)
申请公布日期
1961.02.07
申请号
US19570638394
申请日期
1957.02.05
申请人
NEIL HOUTCOOPER
发明人
HOUTCOOPER NEIL
分类号
E21B7/00
主分类号
E21B7/00
代理机构
代理人
主权项
地址
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