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发明名称
摘要
申请公布号
SU555423(A1)
申请公布日期
1977.04.25
申请号
SU19752175267
申请日期
1975.09.24
申请人
发明人
分类号
G09B23/00;(IPC1-7):G09B23/00
主分类号
G09B23/00
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代理人
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