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发明名称
Tunnel freezing apparatus and method
摘要
申请公布号
US2573725(A)
申请公布日期
1951.11.06
申请号
US19460691962
申请日期
1946.08.21
申请人
POLK ISAAC H
发明人
POLK ISAAC H.
分类号
F25D13/06
主分类号
F25D13/06
代理机构
代理人
主权项
地址
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