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发明名称
REVERSE AIR STOPPING FOR EXCAVATIONS CROSSINGS
摘要
申请公布号
PL267174(A1)
申请公布日期
1988.03.17
申请号
PL19870267174
申请日期
1987.08.03
申请人
发明人
分类号
E21F;E21F1/14;(IPC1-7):E21F/
主分类号
E21F
代理机构
代理人
主权项
地址
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