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发明名称
摘要
申请公布号
SU392250(A1)
申请公布日期
1973.07.27
申请号
SU19701469229
申请日期
1970.08.10
申请人
发明人
分类号
E21F9/00;(IPC1-7):E21F9/00
主分类号
E21F9/00
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代理人
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地址
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