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发明名称
QUARRY VENTILATING DEVICE
摘要
申请公布号
SU575428(A1)
申请公布日期
1977.10.05
申请号
SU19752142239
申请日期
1975.06.09
申请人
AFANASEV KONSTANTIN M,SU
发明人
AFANASEV KONSTANTIN M,SU
分类号
E21F1/00;(IPC1-7):E21F1/00
主分类号
E21F1/00
代理机构
代理人
主权项
地址
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